Crystal chemistry of lamprophyllite-group minerals from the Murun alkaline complex (Russia) and pegmatites of Rocky Boy and Gordon Butte (USA): single crystal X-ray diffraction and Raman spectroscopy study

Specific features of the crystal chemistry of lamprophyllite-related minerals are discussed, using the available literature data and the results of the single-crystal X-ray diffraction and Raman spectroscopic studies of several samples from the Murun alkaline complex (Russia) and Rocky Boy and Gordon Butte pegmatites (USA) presented here.