[N(CH₃)₄]₄H₁₂Ge₉O₂₆^.14H₂O

The {Ge₉O₁₄(OH)₁₂}^4- cluster contains a central GeO₆ octahedron corner-linked to four GeO₄ tetrahedra, which are in turn corner-linked to an adjacent tetrahedron and a GeO₅ trigonal bipyramid. Each of the four trigonal bipyramids shares a common edge with another, and one vertex of each edge is connected to the central octahedron.

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