research papers
Crystal structures of unquenchable high-temperature polymorphs of Ca2SiO4, important in cement chemistry, have eluded single-crystal X-ray analysis. However, the problem may be addressed by studying chemically stabilized Ca2SiO4 polymorphs at ambient temperature. Here an incommensurately modulated crystal structure of flamite [Pnma(0β0)00s, q = 0.2728 (2)b*, a = 6.8588 (2) Å, b = 5.4301 (2) Å, c = 9.4052 (3) Å] is described. It is a mineral analogue of orthorhombic -Ca2SiO4 (stable between 1160 and 1425°C), naturally stabilized by substitution with phosphorus. The incommensurate modulation results from wave-like displacement of cation sites accompanied by tilting of (Si,P)O4 tetrahedra and variation of the Na/(Ca + Na + K) ratio along the modulation period. The studied sample from Hatrurim Basin (Negev Desert, Israel) with composition (Ca1.75K0.12Na0.12)1.99(Si0.74P0.26)1.00O4 also demonstrates pseudomerohedral cyclic twinning around the a axis, which results from pseudohexagonal topology of the crystal structure and complicates the indexing of X-ray diffraction data.
Keywords: flamite; calcium orthosilicate; aperiodic structure; incommensurate modulation; combustion metamorphism.
Supporting information
Crystallographic Information File (CIF) https://doi.org/10.1107/S2052520619013623/dk5083sup1.cif | |
Structure factor file (CIF format) https://doi.org/10.1107/S2052520619013623/dk5083Isup2.hkl | |
Moving Picture Experts Group (MP4) video file https://doi.org/10.1107/S2052520619013623/dk5083sup3.mp4 |
B-IncStrDB reference: 15142EGPJV9
CCDC reference: 1957702
Computing details top
Data collection: CrysAlis PRO 1.171.39.46 (Rigaku OD, 2018); cell refinement: CrysAlis PRO 1.171.39.46 (Rigaku OD, 2018); data reduction: CrysAlis PRO 1.171.39.46 (Rigaku OD, 2018).
(I) top
Crystal data top
Ca1.75Na0.12K0.12Si0.74P0.26O4 | F(000) = 333 |
Mr = 170.4 | Dx = 3.232 Mg m−3 |
Orthorhombic, Pnma(0β0)00s† | Mo Kα radiation, λ = 0.71073 Å |
q = 0.2728(2)b* | Cell parameters from 10460 reflections |
a = 6.8588 (2) Å | θ = 3.1–25° |
b = 5.4301 (2) Å | µ = 3.27 mm−1 |
c = 9.4052 (3) Å | T = 293 K |
V = 350.29 (2) Å3 | Irregular grain, colourless |
Z = 4 | 0.23 × 0.15 × 0.10 mm |
† Symmetry operations: (1) x1, x2, x3, x4; (2) −x1+1/2, −x2, x3+1/2, −x4+1/2; (3) −x1, x2+1/2, −x3, x4+1/2; (4) x1+1/2, −x2+1/2, −x3+1/2, −x4; (5) −x1, −x2, −x3, −x4; (6) x1+1/2, x2, −x3+1/2, x4+1/2; (7) x1, −x2+1/2, x3, −x4+1/2; (8) −x1+1/2, x2+1/2, x3+1/2, x4. |
Data collection top
STOE IPDS2T diffractometer | 4505 independent reflections |
Radiation source: X-ray tube | 3283 reflections with I > 3σ(I) |
Graphite monochromator | Rint = 0.108 |
ω scans | θmax = 25.1°, θmin = 2.0° |
Absorption correction: multi-scan CrysAlisPro 1.171.39.46 (Rigaku Oxford Diffraction, 2018) Empirical absorption correction using spherical harmonics, implemented in SCALE3 ABSPACK scaling algorithm. | h = −8→8 |
Tmin = 0.834, Tmax = 1 | k = −6→6 |
103850 measured reflections | l = −11→11 |
Refinement top
Refinement on F2 | 0 restraints |
R[F2 > 2σ(F2)] = 0.087 | 0 constraints |
wR(F2) = 0.167 | Weighting scheme based on measured s.u.'s w = 1/(σ2(I) + 0.0004I2) |
S = 3.70 | (Δ/σ)max = 0.0001 |
4505 reflections | Δρmax = 2.76 e Å−3 |
144 parameters | Δρmin = −2.39 e Å−3 |
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
x | y | z | Uiso*/Ueq | Occ. (<1) | |
Ca1 | 0.67002 (15) | 0.25 | 0.07550 (10) | 0.0260 (4) | 0.880 (5) |
Ca2 | 0.00538 (12) | 0.75 | 0.21004 (9) | 0.0209 (3) | 0.980 (6) |
Si1 | 0.27271 (16) | 0.75 | 0.57986 (12) | 0.0184 (4) | |
O1 | 0.1943 (5) | 0.75 | 0.4261 (3) | 0.0317 (10) | |
O2 | 0.1948 (3) | 0.5155 (4) | 0.6545 (2) | 0.0378 (8) | |
O3 | 0.4895 (5) | 0.75 | 0.5788 (4) | 0.0423 (13) |
Atomic displacement parameters (Å2) top
U11 | U22 | U33 | U12 | U13 | U23 | |
Ca1 | 0.0334 (7) | 0.0188 (6) | 0.0258 (7) | 0 | 0.0053 (5) | 0 |
Ca2 | 0.0239 (5) | 0.0175 (5) | 0.0215 (5) | 0 | −0.0003 (4) | 0 |
Si1 | 0.0311 (7) | 0.0081 (5) | 0.0161 (7) | 0 | −0.0033 (5) | 0 |
O1 | 0.0419 (19) | 0.0282 (17) | 0.0250 (18) | 0 | −0.0071 (14) | 0 |
O2 | 0.0642 (18) | 0.0207 (12) | 0.0286 (13) | −0.0031 (10) | 0.0078 (12) | 0.0073 (9) |
O3 | 0.051 (2) | 0.043 (2) | 0.033 (2) | 0 | −0.014 (2) | 0 |
Geometric parameters (Å, º) top
Average | Minimum | Maximum | |
Ca1—Ca1i | 3.864 (3) | 3.735 (3) | 4.046 (3) |
Ca1—Ca1ii | 3.863 (3) | 3.735 (3) | 4.046 (3) |
Ca1—Ca2iii | 3.780 (2) | 3.432 (3) | 4.204 (3) |
Ca1—Ca2iv | 3.784 (2) | 3.432 (3) | 4.204 (3) |
Ca1—Ca2v | 3.652 (3) | 3.602 (4) | 3.752 (4) |
Ca1—Ca2i | 3.490 (2) | 3.413 (4) | 3.529 (4) |
Ca1—Ca2vi | 3.573 (2) | 3.341 (3) | 3.770 (3) |
Ca1—Ca2vii | 3.574 (2) | 3.340 (3) | 3.770 (3) |
Ca1—Si1v | 3.042 (3) | 2.922 (5) | 3.110 (5) |
Ca1—Si1viii | 3.272 (3) | 3.173 (5) | 3.323 (5) |
Ca1—Si1vi | 3.173 (2) | 3.022 (3) | 3.333 (3) |
Ca1—Si1vii | 3.172 (2) | 3.022 (3) | 3.333 (3) |
Ca1—O1vi | 2.735 (5) | 2.372 (7) | 3.280 (7) |
Ca1—O1vii | 2.730 (5) | 2.372 (7) | 3.280 (7) |
Ca1—O2vi | 2.625 (7) | 2.325 (7) | 2.902 (7) |
Ca1—O2ix | 2.627 (7) | 2.325 (7) | 2.902 (7) |
Ca1—O3x | 2.373 (6) | 2.286 (11) | 2.627 (11) |
Ca2—Ca2xi | 3.525 (2) | 3.442 (4) | 3.602 (4) |
Ca2—Ca2vii | 3.527 (2) | 3.442 (4) | 3.602 (4) |
Ca2—Si1v | 3.355 (2) | 3.201 (3) | 3.598 (3) |
Ca2—Si1xii | 3.354 (2) | 3.201 (3) | 3.598 (3) |
Ca2—Si1xi | 3.168 (3) | 3.071 (5) | 3.327 (5) |
Ca2—O1 | 2.430 (6) | 2.410 (9) | 2.454 (9) |
Ca2—O1xi | 2.556 (6) | 2.312 (9) | 2.688 (9) |
Ca2—O2v | 2.587 (7) | 2.318 (7) | 2.783 (7) |
Ca2—O2xiii | 2.390 (7) | 2.289 (7) | 2.535 (7) |
Ca2—O2xiv | 2.390 (7) | 2.289 (7) | 2.535 (7) |
Ca2—O2xv | 2.588 (7) | 2.318 (7) | 2.783 (7) |
Ca2—O3xi | 2.722 (7) | 2.324 (12) | 3.540 (12) |
Si1—O1 | 1.608 (6) | 1.589 (9) | 1.625 (9) |
Si1—O2 | 1.593 (7) | 1.555 (7) | 1.630 (7) |
Si1—O2xvi | 1.593 (7) | 1.555 (7) | 1.630 (7) |
Si1—O3 | 1.575 (7) | 1.510 (11) | 1.640 (11) |
Ca1i—Ca1—Ca1ii | 89.62 (5) | 83.49 (8) | 92.75 (6) |
Ca1i—Ca1—Ca2iii | 89.24 (5) | 79.72 (4) | 95.70 (6) |
Ca1i—Ca1—Ca2iv | 174.10 (7) | 171.73 (6) | 179.62 (8) |
Ca1i—Ca1—Ca2v | 56.67 (5) | 52.86 (5) | 58.89 (4) |
Ca1i—Ca1—Ca2i | 95.80 (6) | 91.40 (5) | 100.06 (5) |
Ca1i—Ca1—Ca2vi | 58.74 (4) | 54.83 (4) | 63.61 (6) |
Ca1i—Ca1—Ca2vii | 123.50 (6) | 122.33 (7) | 124.25 (7) |
Ca1i—Ca1—Si1v | 53.08 (5) | 50.53 (4) | 56.65 (6) |
Ca1i—Ca1—Si1viii | 115.97 (7) | 107.91 (5) | 123.47 (7) |
Ca1i—Ca1—Si1vi | 50.02 (5) | 48.42 (5) | 52.14 (5) |
Ca1i—Ca1—Si1vii | 124.65 (8) | 119.92 (11) | 128.32 (11) |
Ca1i—Ca1—O1vi | 48.50 (8) | 42.44 (9) | 57.69 (10) |
Ca1i—Ca1—O1vii | 138.00 (10) | 129.15 (11) | 150.41 (10) |
Ca1i—Ca1—O2vi | 48.47 (16) | 40.64 (16) | 59.49 (14) |
Ca1i—Ca1—O2ix | 96.78 (16) | 91.19 (17) | 101.71 (14) |
Ca1i—Ca1—O3x | 127.28 (15) | 119.38 (16) | 135.69 (13) |
Ca1ii—Ca1—Ca2iii | 174.12 (7) | 171.74 (6) | 179.77 (10) |
Ca1ii—Ca1—Ca2iv | 89.15 (5) | 79.72 (4) | 95.70 (5) |
Ca1ii—Ca1—Ca2v | 56.68 (5) | 52.86 (5) | 58.89 (4) |
Ca1ii—Ca1—Ca2i | 95.86 (6) | 91.40 (5) | 100.06 (5) |
Ca1ii—Ca1—Ca2vi | 123.49 (6) | 122.33 (6) | 124.25 (8) |
Ca1ii—Ca1—Ca2vii | 58.74 (4) | 54.84 (4) | 63.60 (6) |
Ca1ii—Ca1—Si1v | 53.06 (5) | 50.53 (4) | 56.65 (6) |
Ca1ii—Ca1—Si1viii | 115.89 (7) | 107.90 (5) | 123.48 (7) |
Ca1ii—Ca1—Si1vi | 124.65 (8) | 119.92 (10) | 128.32 (11) |
Ca1ii—Ca1—Si1vii | 50.04 (5) | 48.42 (5) | 52.14 (5) |
Ca1ii—Ca1—O1vi | 138.05 (10) | 129.16 (11) | 150.40 (10) |
Ca1ii—Ca1—O1vii | 48.45 (8) | 42.43 (9) | 57.70 (10) |
Ca1ii—Ca1—O2vi | 96.75 (16) | 91.19 (17) | 101.71 (14) |
Ca1ii—Ca1—O2ix | 48.62 (16) | 40.64 (16) | 59.49 (14) |
Ca1ii—Ca1—O3x | 127.31 (15) | 119.38 (16) | 135.69 (13) |
Ca2iii—Ca1—Ca2iv | 91.86 (5) | 90.76 (7) | 92.85 (5) |
Ca2iii—Ca1—Ca2v | 120.88 (6) | 116.36 (5) | 125.16 (6) |
Ca2iii—Ca1—Ca2i | 82.28 (5) | 77.75 (5) | 87.07 (5) |
Ca2iii—Ca1—Ca2vi | 57.29 (4) | 51.79 (3) | 61.90 (4) |
Ca2iii—Ca1—Ca2vii | 123.46 (6) | 118.85 (9) | 129.12 (6) |
Ca2iii—Ca1—Si1v | 127.40 (6) | 117.26 (6) | 136.36 (7) |
Ca2iii—Ca1—Si1viii | 66.25 (5) | 59.69 (4) | 70.14 (7) |
Ca2iii—Ca1—Si1vi | 53.26 (5) | 47.39 (5) | 59.00 (5) |
Ca2iii—Ca1—Si1vii | 129.22 (7) | 123.71 (6) | 136.85 (7) |
Ca2iii—Ca1—O1vi | 40.74 (8) | 34.51 (10) | 46.86 (6) |
Ca2iii—Ca1—O1vii | 132.46 (10) | 125.27 (14) | 138.31 (8) |
Ca2iii—Ca1—O2vi | 81.37 (15) | 74.10 (14) | 88.68 (17) |
Ca2iii—Ca1—O2ix | 129.09 (17) | 117.10 (15) | 137.89 (18) |
Ca2iii—Ca1—O3x | 52.78 (14) | 45.69 (13) | 66.12 (15) |
Ca2iv—Ca1—Ca2v | 120.83 (6) | 116.36 (5) | 125.16 (6) |
Ca2iv—Ca1—Ca2i | 82.36 (5) | 77.75 (5) | 87.07 (5) |
Ca2iv—Ca1—Ca2vi | 123.51 (6) | 118.85 (9) | 129.12 (6) |
Ca2iv—Ca1—Ca2vii | 57.22 (4) | 51.79 (3) | 61.90 (4) |
Ca2iv—Ca1—Si1v | 127.32 (6) | 117.27 (6) | 136.36 (7) |
Ca2iv—Ca1—Si1viii | 66.21 (5) | 59.69 (4) | 70.14 (7) |
Ca2iv—Ca1—Si1vi | 129.31 (7) | 123.71 (6) | 136.85 (6) |
Ca2iv—Ca1—Si1vii | 53.19 (5) | 47.39 (5) | 59.00 (5) |
Ca2iv—Ca1—O1vi | 132.50 (10) | 125.27 (14) | 138.31 (8) |
Ca2iv—Ca1—O1vii | 40.70 (8) | 34.51 (10) | 46.86 (6) |
Ca2iv—Ca1—O2vi | 129.26 (17) | 117.10 (15) | 137.89 (17) |
Ca2iv—Ca1—O2ix | 81.29 (15) | 74.11 (14) | 88.68 (17) |
Ca2iv—Ca1—O3x | 52.89 (14) | 45.69 (13) | 66.12 (15) |
Ca2v—Ca1—Ca2i | 59.09 (5) | 57.17 (7) | 60.32 (7) |
Ca2v—Ca1—Ca2vi | 115.40 (6) | 111.12 (6) | 121.80 (6) |
Ca2v—Ca1—Ca2vii | 115.40 (6) | 111.12 (6) | 121.79 (6) |
Ca2v—Ca1—Si1v | 71.32 (6) | 70.34 (9) | 72.23 (9) |
Ca2v—Ca1—Si1viii | 166.11 (8) | 162.66 (12) | 173.14 (12) |
Ca2v—Ca1—Si1vi | 68.76 (6) | 67.64 (7) | 70.48 (7) |
Ca2v—Ca1—Si1vii | 68.76 (6) | 67.64 (7) | 70.48 (7) |
Ca2v—Ca1—O1vi | 91.39 (8) | 85.59 (8) | 99.73 (9) |
Ca2v—Ca1—O1vii | 91.35 (8) | 85.59 (8) | 99.73 (9) |
Ca2v—Ca1—O2vi | 40.54 (15) | 38.21 (16) | 44.30 (14) |
Ca2v—Ca1—O2ix | 40.56 (15) | 38.21 (16) | 44.29 (14) |
Ca2v—Ca1—O3x | 109.82 (17) | 100.48 (16) | 127.57 (18) |
Ca2i—Ca1—Ca2vi | 129.42 (6) | 124.29 (7) | 132.51 (5) |
Ca2i—Ca1—Ca2vii | 129.49 (6) | 124.28 (7) | 132.51 (5) |
Ca2i—Ca1—Si1v | 130.35 (8) | 127.51 (13) | 132.55 (13) |
Ca2i—Ca1—Si1viii | 133.48 (7) | 126.53 (11) | 140.17 (12) |
Ca2i—Ca1—Si1vi | 60.19 (5) | 56.62 (5) | 64.75 (5) |
Ca2i—Ca1—Si1vii | 60.25 (5) | 56.62 (5) | 64.75 (5) |
Ca2i—Ca1—O1vi | 87.60 (9) | 83.45 (8) | 93.86 (9) |
Ca2i—Ca1—O1vii | 87.68 (9) | 83.45 (8) | 93.86 (9) |
Ca2i—Ca1—O2vi | 47.60 (16) | 41.16 (14) | 51.98 (18) |
Ca2i—Ca1—O2ix | 47.51 (16) | 41.16 (14) | 51.98 (18) |
Ca2i—Ca1—O3x | 50.76 (16) | 40.44 (16) | 70.39 (16) |
Ca2vi—Ca1—Ca2vii | 99.22 (6) | 93.05 (9) | 105.41 (9) |
Ca2vi—Ca1—Si1v | 71.17 (6) | 67.52 (5) | 75.32 (6) |
Ca2vi—Ca1—Si1viii | 58.55 (5) | 53.23 (4) | 63.24 (5) |
Ca2vi—Ca1—Si1vi | 71.14 (5) | 68.70 (5) | 75.51 (7) |
Ca2vi—Ca1—Si1vii | 169.72 (8) | 163.60 (7) | 174.21 (9) |
Ca2vi—Ca1—O1vi | 42.23 (7) | 39.02 (8) | 46.63 (8) |
Ca2vi—Ca1—O1vii | 140.77 (10) | 134.00 (10) | 146.91 (11) |
Ca2vi—Ca1—O2vi | 93.75 (15) | 85.34 (14) | 98.29 (14) |
Ca2vi—Ca1—O2ix | 154.97 (16) | 149.70 (17) | 164.73 (15) |
Ca2vi—Ca1—O3x | 108.31 (15) | 98.84 (14) | 117.23 (16) |
Ca2vii—Ca1—Si1v | 71.16 (6) | 67.52 (5) | 75.32 (6) |
Ca2vii—Ca1—Si1viii | 58.47 (5) | 53.23 (4) | 63.24 (5) |
Ca2vii—Ca1—Si1vi | 169.71 (8) | 163.60 (7) | 174.21 (9) |
Ca2vii—Ca1—Si1vii | 71.15 (5) | 68.70 (5) | 75.51 (6) |
Ca2vii—Ca1—O1vi | 140.77 (10) | 134.00 (10) | 146.90 (11) |
Ca2vii—Ca1—O1vii | 42.22 (7) | 39.02 (8) | 46.63 (8) |
Ca2vii—Ca1—O2vi | 154.94 (16) | 149.70 (17) | 164.73 (15) |
Ca2vii—Ca1—O2ix | 93.85 (15) | 85.34 (14) | 98.30 (14) |
Ca2vii—Ca1—O3x | 108.33 (15) | 98.84 (14) | 117.23 (16) |
Si1v—Ca1—Si1viii | 95.97 (8) | 92.32 (13) | 100.92 (12) |
Si1v—Ca1—Si1vi | 103.08 (7) | 99.62 (7) | 106.28 (7) |
Si1v—Ca1—Si1vii | 103.09 (7) | 99.62 (7) | 106.28 (7) |
Si1v—Ca1—O1vi | 93.75 (10) | 85.97 (10) | 105.46 (11) |
Si1v—Ca1—O1vii | 93.70 (10) | 85.97 (10) | 105.46 (11) |
Si1v—Ca1—O2vi | 93.86 (17) | 87.16 (17) | 102.56 (16) |
Si1v—Ca1—O2ix | 93.99 (17) | 87.16 (17) | 102.56 (16) |
Si1v—Ca1—O3x | 171.95 (18) | 162.1 (2) | 178.84 (15) |
Si1viii—Ca1—Si1vi | 115.61 (7) | 105.26 (7) | 123.48 (7) |
Si1viii—Ca1—Si1vii | 115.53 (7) | 105.26 (7) | 123.47 (7) |
Si1viii—Ca1—O1vi | 89.25 (8) | 80.65 (9) | 94.84 (7) |
Si1viii—Ca1—O1vii | 89.19 (8) | 80.65 (9) | 94.84 (7) |
Si1viii—Ca1—O2vi | 144.36 (15) | 134.22 (15) | 153.35 (17) |
Si1viii—Ca1—O2ix | 144.31 (15) | 134.22 (15) | 153.36 (17) |
Si1viii—Ca1—O3x | 82.91 (17) | 69.77 (17) | 90.58 (17) |
Si1vi—Ca1—Si1vii | 118.38 (8) | 114.38 (11) | 121.02 (12) |
Si1vi—Ca1—O1vi | 29.94 (7) | 28.20 (6) | 32.51 (9) |
Si1vi—Ca1—O1vii | 146.98 (11) | 142.73 (12) | 150.16 (11) |
Si1vi—Ca1—O2vi | 29.87 (15) | 28.21 (15) | 31.18 (17) |
Si1vi—Ca1—O2ix | 94.53 (15) | 89.31 (14) | 98.56 (16) |
Si1vi—Ca1—O3x | 77.74 (15) | 70.28 (16) | 85.85 (14) |
Si1vii—Ca1—O1vi | 146.97 (11) | 142.73 (12) | 150.16 (11) |
Si1vii—Ca1—O1vii | 29.95 (7) | 28.20 (6) | 32.51 (9) |
Si1vii—Ca1—O2vi | 94.62 (15) | 89.31 (14) | 98.56 (16) |
Si1vii—Ca1—O2ix | 29.88 (15) | 28.21 (15) | 31.18 (17) |
Si1vii—Ca1—O3x | 77.75 (15) | 70.28 (16) | 85.86 (14) |
O1vi—Ca1—O1vii | 169.51 (17) | 159.8 (2) | 175.94 (14) |
O1vi—Ca1—O2vi | 56.93 (18) | 50.19 (18) | 62.25 (19) |
O1vi—Ca1—O2ix | 122.60 (19) | 117.9 (2) | 127.4 (2) |
O1vi—Ca1—O3x | 86.75 (19) | 75.4 (2) | 94.72 (18) |
O1vii—Ca1—O2vi | 122.66 (19) | 117.9 (2) | 127.4 (2) |
O1vii—Ca1—O2ix | 56.98 (18) | 50.19 (19) | 62.3 (2) |
O1vii—Ca1—O3x | 86.83 (19) | 75.4 (2) | 94.72 (19) |
O2vi—Ca1—O2ix | 68.1 (2) | 67.9 (2) | 68.4 (2) |
O2vi—Ca1—O3x | 87.0 (2) | 72.0 (2) | 105.6 (2) |
O2ix—Ca1—O3x | 86.9 (2) | 72.0 (2) | 105.6 (2) |
Ca1xvii—Ca2—Ca1xviii | 91.81 (5) | 85.14 (7) | 95.24 (5) |
Ca1xvii—Ca2—Ca1xix | 96.39 (5) | 93.45 (6) | 98.71 (5) |
Ca1xvii—Ca2—Ca1ii | 97.64 (6) | 93.03 (4) | 101.41 (5) |
Ca1xvii—Ca2—Ca1xx | 80.40 (5) | 76.19 (4) | 82.80 (4) |
Ca1xvii—Ca2—Ca1xi | 158.04 (7) | 152.99 (9) | 160.65 (5) |
Ca1xvii—Ca2—Ca2xi | 58.37 (4) | 53.43 (5) | 62.72 (4) |
Ca1xvii—Ca2—Ca2vii | 131.92 (5) | 120.26 (4) | 140.00 (6) |
Ca1xvii—Ca2—Si1v | 64.81 (5) | 57.26 (4) | 72.05 (5) |
Ca1xvii—Ca2—Si1xii | 137.37 (7) | 135.01 (7) | 140.64 (6) |
Ca1xvii—Ca2—Si1xi | 53.35 (5) | 48.60 (4) | 60.78 (5) |
Ca1xvii—Ca2—O1 | 127.4 (2) | 117.5 (2) | 134.8 (2) |
Ca1xvii—Ca2—O1xi | 45.9 (2) | 31.61 (19) | 63.38 (19) |
Ca1xvii—Ca2—O2v | 90.69 (15) | 75.46 (17) | 101.45 (14) |
Ca1xvii—Ca2—O2xiii | 105.43 (17) | 95.54 (16) | 113.75 (18) |
Ca1xvii—Ca2—O2xiv | 52.46 (16) | 45.10 (15) | 58.09 (17) |
Ca1xvii—Ca2—O2xv | 145.11 (16) | 133.58 (14) | 152.27 (17) |
Ca1xvii—Ca2—O3xi | 69.44 (13) | 66.02 (11) | 72.50 (14) |
Ca1xviii—Ca2—Ca1xix | 96.38 (5) | 93.45 (6) | 98.71 (5) |
Ca1xviii—Ca2—Ca1ii | 97.66 (6) | 93.03 (4) | 101.41 (5) |
Ca1xviii—Ca2—Ca1xx | 158.04 (7) | 152.99 (9) | 160.65 (5) |
Ca1xviii—Ca2—Ca1xi | 80.42 (5) | 76.19 (4) | 82.80 (4) |
Ca1xviii—Ca2—Ca2xi | 58.38 (4) | 53.43 (5) | 62.72 (4) |
Ca1xviii—Ca2—Ca2vii | 131.98 (5) | 120.26 (5) | 140.00 (6) |
Ca1xviii—Ca2—Si1v | 137.36 (7) | 135.01 (7) | 140.64 (6) |
Ca1xviii—Ca2—Si1xii | 64.86 (5) | 57.26 (4) | 72.05 (5) |
Ca1xviii—Ca2—Si1xi | 53.39 (5) | 48.60 (4) | 60.78 (5) |
Ca1xviii—Ca2—O1 | 127.3 (2) | 117.5 (2) | 134.8 (2) |
Ca1xviii—Ca2—O1xi | 46.0 (2) | 31.61 (19) | 63.38 (19) |
Ca1xviii—Ca2—O2v | 145.19 (16) | 133.58 (14) | 152.27 (17) |
Ca1xviii—Ca2—O2xiii | 52.46 (16) | 45.10 (15) | 58.09 (17) |
Ca1xviii—Ca2—O2xiv | 105.46 (17) | 95.54 (16) | 113.75 (18) |
Ca1xviii—Ca2—O2xv | 90.78 (15) | 75.46 (17) | 101.45 (14) |
Ca1xviii—Ca2—O3xi | 69.43 (13) | 66.02 (11) | 72.51 (14) |
Ca1xix—Ca2—Ca1ii | 158.97 (7) | 157.71 (6) | 161.93 (10) |
Ca1xix—Ca2—Ca1xx | 64.57 (5) | 62.25 (5) | 66.67 (4) |
Ca1xix—Ca2—Ca1xi | 64.56 (5) | 62.25 (5) | 66.67 (4) |
Ca1xix—Ca2—Ca2xi | 58.12 (5) | 56.45 (7) | 59.03 (4) |
Ca1xix—Ca2—Ca2vii | 96.47 (5) | 95.56 (9) | 97.25 (8) |
Ca1xix—Ca2—Si1v | 119.48 (6) | 114.18 (6) | 123.27 (6) |
Ca1xix—Ca2—Si1xii | 119.49 (6) | 114.18 (6) | 123.27 (6) |
Ca1xix—Ca2—Si1xi | 129.84 (7) | 126.60 (10) | 131.90 (10) |
Ca1xix—Ca2—O1 | 52.89 (10) | 47.35 (11) | 57.85 (10) |
Ca1xix—Ca2—O1xi | 100.36 (9) | 99.89 (8) | 101.28 (11) |
Ca1xix—Ca2—O2v | 116.33 (16) | 109.29 (17) | 123.24 (15) |
Ca1xix—Ca2—O2xiii | 45.68 (16) | 38.95 (16) | 52.90 (15) |
Ca1xix—Ca2—O2xiv | 45.70 (16) | 38.95 (16) | 52.90 (15) |
Ca1xix—Ca2—O2xv | 116.38 (16) | 109.29 (17) | 123.24 (15) |
Ca1xix—Ca2—O3xi | 158.77 (14) | 153.73 (13) | 162.12 (15) |
Ca1ii—Ca2—Ca1xx | 103.45 (6) | 96.87 (5) | 108.55 (5) |
Ca1ii—Ca2—Ca1xi | 103.48 (6) | 96.88 (5) | 108.55 (5) |
Ca1ii—Ca2—Ca2xi | 141.60 (6) | 139.76 (5) | 144.76 (10) |
Ca1ii—Ca2—Ca2vii | 62.76 (5) | 61.10 (4) | 66.37 (8) |
Ca1ii—Ca2—Si1v | 55.17 (5) | 52.73 (5) | 60.09 (5) |
Ca1ii—Ca2—Si1xii | 55.17 (5) | 52.73 (5) | 60.09 (5) |
Ca1ii—Ca2—Si1xi | 69.91 (6) | 69.15 (5) | 71.47 (8) |
Ca1ii—Ca2—O1 | 107.75 (10) | 100.93 (12) | 114.83 (13) |
Ca1ii—Ca2—O1xi | 98.34 (9) | 97.43 (8) | 99.77 (11) |
Ca1ii—Ca2—O2v | 48.57 (15) | 41.15 (14) | 54.71 (16) |
Ca1ii—Ca2—O2xiii | 141.02 (16) | 134.47 (17) | 149.14 (16) |
Ca1ii—Ca2—O2xiv | 140.97 (16) | 134.47 (17) | 149.14 (16) |
Ca1ii—Ca2—O2xv | 48.51 (15) | 41.15 (14) | 54.71 (16) |
Ca1ii—Ca2—O3xi | 41.50 (13) | 39.65 (14) | 44.34 (11) |
Ca1xx—Ca2—Ca1xi | 99.23 (6) | 97.01 (8) | 100.96 (5) |
Ca1xx—Ca2—Ca2xi | 100.61 (5) | 97.59 (7) | 105.65 (5) |
Ca1xx—Ca2—Ca2vii | 64.37 (5) | 57.31 (4) | 71.01 (4) |
Ca1xx—Ca2—Si1v | 56.23 (5) | 53.17 (5) | 59.44 (5) |
Ca1xx—Ca2—Si1xii | 132.72 (7) | 125.59 (6) | 137.36 (6) |
Ca1xx—Ca2—Si1xi | 130.27 (6) | 120.18 (5) | 139.16 (6) |
Ca1xx—Ca2—O1 | 49.8 (2) | 38.4 (2) | 62.2 (2) |
Ca1xx—Ca2—O1xi | 123.54 (19) | 106.63 (18) | 140.45 (16) |
Ca1xx—Ca2—O2v | 55.17 (15) | 43.55 (16) | 65.50 (14) |
Ca1xx—Ca2—O2xiii | 109.68 (17) | 104.70 (17) | 115.53 (16) |
Ca1xx—Ca2—O2xiv | 53.94 (17) | 46.70 (18) | 66.20 (16) |
Ca1xx—Ca2—O2xv | 106.77 (16) | 97.00 (14) | 115.86 (18) |
Ca1xx—Ca2—O3xi | 125.01 (13) | 120.79 (13) | 129.85 (11) |
Ca1xi—Ca2—Ca2xi | 100.62 (5) | 97.59 (7) | 105.65 (5) |
Ca1xi—Ca2—Ca2vii | 64.41 (5) | 57.31 (4) | 71.02 (4) |
Ca1xi—Ca2—Si1v | 132.75 (7) | 125.59 (6) | 137.35 (6) |
Ca1xi—Ca2—Si1xii | 56.24 (5) | 53.17 (5) | 59.44 (5) |
Ca1xi—Ca2—Si1xi | 130.33 (6) | 120.18 (5) | 139.16 (6) |
Ca1xi—Ca2—O1 | 49.8 (2) | 38.4 (2) | 62.2 (2) |
Ca1xi—Ca2—O1xi | 123.71 (19) | 106.63 (18) | 140.45 (16) |
Ca1xi—Ca2—O2v | 106.83 (16) | 97.00 (14) | 115.86 (18) |
Ca1xi—Ca2—O2xiii | 53.99 (17) | 46.70 (18) | 66.20 (16) |
Ca1xi—Ca2—O2xiv | 109.68 (17) | 104.69 (17) | 115.53 (16) |
Ca1xi—Ca2—O2xv | 55.25 (15) | 43.55 (16) | 65.50 (14) |
Ca1xi—Ca2—O3xi | 125.00 (13) | 120.79 (13) | 129.85 (11) |
Ca2xi—Ca2—Ca2vii | 153.12 (6) | 152.50 (6) | 153.70 (10) |
Ca2xi—Ca2—Si1v | 121.61 (6) | 111.66 (6) | 133.81 (6) |
Ca2xi—Ca2—Si1xii | 121.67 (6) | 111.66 (6) | 133.82 (6) |
Ca2xi—Ca2—Si1xi | 71.88 (6) | 68.45 (7) | 75.45 (8) |
Ca2xi—Ca2—O1 | 110.54 (10) | 104.98 (12) | 114.31 (12) |
Ca2xi—Ca2—O1xi | 43.41 (8) | 42.00 (9) | 45.29 (9) |
Ca2xi—Ca2—O2v | 145.20 (15) | 126.85 (17) | 163.36 (14) |
Ca2xi—Ca2—O2xiii | 47.29 (17) | 40.88 (15) | 51.55 (18) |
Ca2xi—Ca2—O2xiv | 47.32 (17) | 40.88 (15) | 51.55 (18) |
Ca2xi—Ca2—O2xv | 145.32 (15) | 126.85 (17) | 163.36 (14) |
Ca2xi—Ca2—O3xi | 100.77 (13) | 95.58 (12) | 104.61 (15) |
Ca2vii—Ca2—Si1v | 68.50 (5) | 65.09 (5) | 72.52 (6) |
Ca2vii—Ca2—Si1xii | 68.51 (5) | 65.09 (5) | 72.51 (6) |
Ca2vii—Ca2—Si1xi | 131.84 (7) | 128.60 (6) | 137.84 (10) |
Ca2vii—Ca2—O1 | 46.35 (10) | 39.40 (10) | 50.30 (10) |
Ca2vii—Ca2—O1xi | 154.61 (15) | 148.48 (15) | 164.28 (14) |
Ca2vii—Ca2—O2v | 42.65 (15) | 39.86 (14) | 45.31 (17) |
Ca2vii—Ca2—O2xiii | 116.31 (18) | 102.15 (18) | 133.90 (17) |
Ca2vii—Ca2—O2xiv | 116.24 (18) | 102.15 (18) | 133.89 (17) |
Ca2vii—Ca2—O2xv | 42.63 (15) | 39.86 (14) | 45.31 (17) |
Ca2vii—Ca2—O3xi | 104.23 (14) | 100.76 (15) | 110.72 (12) |
Si1v—Ca2—Si1xii | 108.65 (7) | 104.35 (7) | 117.24 (9) |
Si1v—Ca2—Si1xi | 84.99 (6) | 75.26 (5) | 94.01 (6) |
Si1v—Ca2—O1 | 93.49 (18) | 82.65 (18) | 106.02 (19) |
Si1v—Ca2—O1xi | 101.58 (17) | 83.50 (16) | 121.11 (16) |
Si1v—Ca2—O2v | 26.53 (15) | 20.40 (17) | 29.94 (14) |
Si1v—Ca2—O2xiii | 160.08 (17) | 152.16 (16) | 167.81 (18) |
Si1v—Ca2—O2xiv | 88.24 (16) | 81.58 (17) | 100.94 (15) |
Si1v—Ca2—O2xv | 91.43 (15) | 81.24 (13) | 97.48 (17) |
Si1v—Ca2—O3xi | 69.50 (13) | 65.73 (15) | 74.93 (11) |
Si1xii—Ca2—Si1xi | 85.05 (6) | 75.26 (5) | 94.01 (6) |
Si1xii—Ca2—O1 | 93.43 (18) | 82.65 (18) | 106.02 (19) |
Si1xii—Ca2—O1xi | 101.76 (17) | 83.50 (16) | 121.11 (16) |
Si1xii—Ca2—O2v | 91.49 (15) | 81.24 (13) | 97.48 (17) |
Si1xii—Ca2—O2xiii | 88.30 (16) | 81.58 (17) | 100.94 (15) |
Si1xii—Ca2—O2xiv | 160.12 (17) | 152.16 (16) | 167.80 (18) |
Si1xii—Ca2—O2xv | 26.56 (15) | 20.40 (17) | 29.94 (14) |
Si1xii—Ca2—O3xi | 69.49 (13) | 65.73 (15) | 74.94 (11) |
Si1xi—Ca2—O1 | 172.94 (15) | 170.24 (15) | 176.74 (18) |
Si1xi—Ca2—O1xi | 29.88 (9) | 26.46 (10) | 31.49 (8) |
Si1xi—Ca2—O2v | 102.53 (16) | 94.54 (18) | 108.55 (15) |
Si1xi—Ca2—O2xiii | 99.72 (18) | 91.57 (16) | 104.27 (19) |
Si1xi—Ca2—O2xiv | 99.71 (18) | 91.57 (16) | 104.27 (19) |
Si1xi—Ca2—O2xv | 102.56 (16) | 94.54 (18) | 108.55 (15) |
Si1xi—Ca2—O3xi | 29.15 (13) | 27.13 (11) | 31.29 (14) |
O1—Ca2—O1xi | 152.53 (17) | 146.5 (2) | 158.23 (19) |
O1—Ca2—O2v | 75.8 (2) | 68.23 (19) | 86.8 (2) |
O1—Ca2—O2xiii | 82.2 (2) | 74.9 (2) | 86.3 (3) |
O1—Ca2—O2xiv | 82.2 (2) | 74.9 (2) | 86.3 (3) |
O1—Ca2—O2xv | 75.8 (2) | 68.23 (19) | 86.8 (2) |
O1—Ca2—O3xi | 148.1 (2) | 141.2 (2) | 158.28 (19) |
O1xi—Ca2—O2v | 123.3 (2) | 103.7 (2) | 136.9 (2) |
O1xi—Ca2—O2xiii | 76.9 (2) | 73.7 (2) | 84.9 (2) |
O1xi—Ca2—O2xiv | 76.8 (2) | 73.7 (2) | 84.9 (2) |
O1xi—Ca2—O2xv | 123.4 (2) | 103.7 (2) | 136.9 (2) |
O1xi—Ca2—O3xi | 58.82 (18) | 53.58 (17) | 62.66 (17) |
O2v—Ca2—O2xiii | 153.0 (2) | 142.7 (2) | 165.7 (2) |
O2v—Ca2—O2xiv | 102.9 (2) | 83.5 (2) | 125.2 (2) |
O2v—Ca2—O2xv | 69.3 (2) | 68.8 (2) | 69.7 (2) |
O2v—Ca2—O3xi | 80.1 (2) | 73.3 (2) | 85.16 (18) |
O2xiii—Ca2—O2xiv | 76.3 (2) | 74.5 (2) | 79.4 (2) |
O2xiii—Ca2—O2xv | 103.0 (2) | 83.5 (2) | 125.2 (2) |
O2xiii—Ca2—O3xi | 121.3 (2) | 112.93 (19) | 128.2 (2) |
O2xiv—Ca2—O2xv | 152.9 (2) | 142.7 (2) | 165.7 (2) |
O2xiv—Ca2—O3xi | 121.4 (2) | 112.93 (19) | 128.2 (2) |
O2xv—Ca2—O3xi | 80.0 (2) | 73.3 (2) | 85.17 (18) |
Ca1xix—Si1—Ca1xxi | 97.70 (8) | 93.99 (13) | 102.59 (13) |
Ca1xix—Si1—Ca1xx | 76.92 (7) | 71.57 (6) | 80.29 (6) |
Ca1xix—Si1—Ca1xi | 76.91 (7) | 71.57 (6) | 80.29 (6) |
Ca1xix—Si1—Ca2xix | 117.44 (7) | 108.86 (7) | 123.15 (7) |
Ca1xix—Si1—Ca2xxii | 117.42 (7) | 108.86 (7) | 123.15 (7) |
Ca1xix—Si1—Ca2vii | 119.19 (8) | 116.24 (6) | 123.95 (15) |
Ca1xix—Si1—O1 | 70.43 (16) | 60.04 (18) | 84.6 (2) |
Ca1xix—Si1—O2 | 70.2 (3) | 54.6 (3) | 92.3 (3) |
Ca1xix—Si1—O2xvi | 70.2 (3) | 54.6 (3) | 92.3 (3) |
Ca1xix—Si1—O3 | 159.2 (2) | 152.3 (3) | 168.2 (2) |
Ca1xxi—Si1—Ca1xx | 118.94 (7) | 111.36 (6) | 127.37 (8) |
Ca1xxi—Si1—Ca1xi | 118.89 (7) | 111.36 (6) | 127.37 (8) |
Ca1xxi—Si1—Ca2xix | 65.29 (6) | 59.67 (5) | 70.57 (5) |
Ca1xxi—Si1—Ca2xxii | 65.25 (6) | 59.67 (5) | 70.57 (5) |
Ca1xxi—Si1—Ca2vii | 142.64 (8) | 133.46 (13) | 149.24 (15) |
Ca1xxi—Si1—O1 | 158.2 (3) | 150.63 (19) | 172.8 (2) |
Ca1xxi—Si1—O2 | 66.5 (3) | 46.0 (2) | 84.9 (3) |
Ca1xxi—Si1—O2xvi | 66.4 (3) | 46.0 (2) | 84.9 (3) |
Ca1xxi—Si1—O3 | 83.2 (2) | 49.7 (2) | 100.4 (2) |
Ca1xx—Si1—Ca1xi | 118.20 (9) | 111.83 (13) | 121.49 (7) |
Ca1xx—Si1—Ca2xix | 64.62 (5) | 62.45 (5) | 68.64 (4) |
Ca1xx—Si1—Ca2xxii | 165.04 (9) | 157.28 (14) | 172.54 (11) |
Ca1xx—Si1—Ca2vii | 73.37 (6) | 64.23 (5) | 83.92 (6) |
Ca1xx—Si1—O1 | 59.5 (3) | 47.2 (3) | 74.1 (3) |
Ca1xx—Si1—O2 | 55.5 (2) | 48.0 (2) | 65.5 (2) |
Ca1xx—Si1—O2xvi | 145.8 (3) | 134.7 (3) | 161.0 (3) |
Ca1xx—Si1—O3 | 103.1 (2) | 80.2 (2) | 115.4 (2) |
Ca1xi—Si1—Ca2xix | 165.04 (9) | 157.28 (14) | 172.54 (11) |
Ca1xi—Si1—Ca2xxii | 64.62 (5) | 62.45 (5) | 68.64 (4) |
Ca1xi—Si1—Ca2vii | 73.42 (6) | 64.23 (5) | 83.92 (6) |
Ca1xi—Si1—O1 | 59.4 (3) | 47.2 (3) | 74.1 (3) |
Ca1xi—Si1—O2 | 145.8 (3) | 134.7 (3) | 161.0 (3) |
Ca1xi—Si1—O2xvi | 55.6 (2) | 48.0 (2) | 65.5 (2) |
Ca1xi—Si1—O3 | 103.2 (2) | 80.2 (2) | 115.4 (2) |
Ca2xix—Si1—Ca2xxii | 108.35 (7) | 102.02 (11) | 113.49 (11) |
Ca2xix—Si1—Ca2vii | 94.64 (6) | 86.05 (6) | 104.77 (6) |
Ca2xix—Si1—O1 | 118.9 (3) | 107.0 (3) | 135.2 (3) |
Ca2xix—Si1—O2 | 48.1 (3) | 29.9 (3) | 60.2 (3) |
Ca2xix—Si1—O2xvi | 131.1 (3) | 114.3 (2) | 145.7 (3) |
Ca2xix—Si1—O3 | 64.0 (2) | 48.0 (2) | 87.3 (2) |
Ca2xxii—Si1—Ca2vii | 94.68 (6) | 86.05 (6) | 104.77 (6) |
Ca2xxii—Si1—O1 | 118.8 (3) | 107.0 (3) | 135.2 (3) |
Ca2xxii—Si1—O2 | 131.2 (3) | 114.3 (2) | 145.7 (3) |
Ca2xxii—Si1—O2xvi | 48.1 (3) | 29.9 (3) | 60.2 (3) |
Ca2xxii—Si1—O3 | 64.0 (2) | 48.0 (2) | 87.3 (2) |
Ca2vii—Si1—O1 | 53.01 (16) | 39.33 (16) | 60.29 (15) |
Ca2vii—Si1—O2 | 123.6 (3) | 113.0 (3) | 136.2 (3) |
Ca2vii—Si1—O2xvi | 123.7 (3) | 113.0 (3) | 136.2 (3) |
Ca2vii—Si1—O3 | 59.6 (2) | 47.5 (2) | 83.8 (3) |
O1—Si1—O2 | 107.1 (3) | 98.3 (3) | 115.6 (4) |
O1—Si1—O2xvi | 107.1 (3) | 98.3 (3) | 115.5 (4) |
O1—Si1—O3 | 112.1 (3) | 107.3 (4) | 123.1 (4) |
O2—Si1—O2xvi | 111.4 (4) | 108.4 (3) | 116.1 (4) |
O2—Si1—O3 | 109.6 (3) | 104.7 (4) | 114.8 (3) |
O2xvi—Si1—O3 | 109.6 (3) | 104.7 (4) | 114.8 (3) |
Ca1xx—O1—Ca1xi | 172.3 (3) | 159.5 (3) | 178.9 (2) |
Ca1xx—O1—Ca2 | 87.90 (17) | 76.91 (13) | 102.58 (19) |
Ca1xx—O1—Ca2vii | 93.35 (18) | 69.87 (11) | 113.4 (2) |
Ca1xx—O1—Si1 | 90.5 (2) | 77.69 (10) | 103.2 (3) |
Ca1xi—O1—Ca2 | 87.95 (17) | 76.91 (14) | 102.58 (19) |
Ca1xi—O1—Ca2vii | 93.48 (18) | 69.87 (11) | 113.4 (2) |
Ca1xi—O1—Si1 | 90.6 (2) | 77.69 (10) | 103.2 (3) |
Ca2—O1—Ca2vii | 90.26 (18) | 85.08 (12) | 98.6 (2) |
Ca2—O1—Si1 | 153.8 (3) | 147.2 (3) | 162.2 (3) |
Ca2vii—O1—Si1 | 97.2 (3) | 88.2 (2) | 114.2 (3) |
Ca1xx—O2—Ca2xix | 83.9 (2) | 79.09 (18) | 87.5 (2) |
Ca1xx—O2—Ca2xxiii | 93.8 (2) | 82.94 (19) | 102.8 (2) |
Ca1xx—O2—Si1 | 94.6 (3) | 84.0 (3) | 102.4 (3) |
Ca2xix—O2—Ca2xxiii | 90.1 (2) | 85.6 (2) | 94.1 (2) |
Ca2xix—O2—Si1 | 105.3 (3) | 90.2 (3) | 129.7 (4) |
Ca2xxiii—O2—Si1 | 154.8 (4) | 134.1 (4) | 166.3 (4) |
Ca1xxiv—O3—Ca2vii | 87.5 (2) | 65.3 (3) | 99.91 (17) |
Ca1xxiv—O3—Si1 | 152.2 (4) | 134.4 (6) | 165.6 (4) |
Ca2vii—O3—Si1 | 91.3 (3) | 69.1 (4) | 101.3 (2) |
Symmetry codes: (i) −x1+1, x2−1/2, −x3, x4+1/2; (ii) −x1+1, x2+1/2, −x3, x4+1/2; (iii) x1+1, x2−1, x3, x4; (iv) x1+1, x2, x3, x4; (v) −x1+1/2, −x2+1, x3−1/2, −x4+1/2; (vi) x1+1/2, −x2+1/2, −x3+1/2, −x4; (vii) x1+1/2, −x2+3/2, −x3+1/2, −x4; (viii) −x1+1, x2−1/2, −x3+1, x4+1/2; (ix) x1+1/2, x2, −x3+1/2, x4+1/2; (x) −x1+3/2, −x2+1, x3−1/2, −x4+1/2; (xi) x1−1/2, −x2+3/2, −x3+1/2, −x4; (xii) −x1+1/2, −x2+2, x3−1/2, −x4+1/2; (xiii) −x1, x2+1/2, −x3+1, x4+1/2; (xiv) −x1, −x2+1, −x3+1, −x4; (xv) −x1+1/2, x2+1/2, x3−1/2, x4; (xvi) x1, −x2+3/2, x3, −x4+1/2; (xvii) x1−1, x2, x3, x4; (xviii) x1−1, x2+1, x3, x4; (xix) −x1+1/2, −x2+1, x3+1/2, −x4+1/2; (xx) x1−1/2, −x2+1/2, −x3+1/2, −x4; (xxi) −x1+1, x2+1/2, −x3+1, x4+1/2; (xxii) −x1+1/2, −x2+2, x3+1/2, −x4+1/2; (xxiii) −x1, x2−1/2, −x3+1, x4+1/2; (xxiv) −x1+3/2, −x2+1, x3+1/2, −x4+1/2. |