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American Mineralogist; June 1999; v. 84; no. 5-6; p. 987-989
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Crystal chemistry of high-pressure BaSi 4 O 9 in the trigonal (P3) barium tetragermanate structure

R. M. Hazen, H. Yang, L. W. Finger, and B. A. Fursenko

Geophysical Laboratory and Center for High-Pressure Research, Washington, DC, United States

Crystals of BaSi 4 O 9 synthesized at 4 GPa and 1000 degrees C were determined to be isostructural with barium tetragermanate [trigonal, space group P3, a = 11.2469(11) and c = 4.4851(6) Aa, V = 491.3(1) Aa 3 ]. The structure (R = 2.4%) features a corner-linked framework of three-member silicate tetrahedral rings, which are cross-linked by isolated silicate octahedra. Ba cations occupy tenfold-coordinated sites in channels defined by the silicate framework. This structure is 4.2% denser than the topologically similar benitoite form of high-pressure BaSi 4 O 9 , which was produced by grinding the barium tetragermanate-type crystals described in this report.

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