Zoltaiite, a new barium-vanadium nesosubsilicate mineral from British Columbia: Description and crystal structure
-
Paul R. Bartholomew
,
Franco Mancini
Abstract
Zoltaiite, ideal formula BaV24+V123+ Si2O27, space group P3̅, a = 7.601(1), c = 9.219(1) Å, V = 461.34(1) Å3, Z = 1, is a new mineral found on the eastern edge of the Shuswap metamorphic complex of British Columbia, Canada. It is a metamorphic mineral formed under greenschist-facies P-T conditions as part of an assemblage that includes quartz, celsian, apatite, sphalerite, pyrrhotite, galena, and pyrite. Zoltaiite has a Mohs hardness of 6.7, no cleavage, an anhedral to semi-prismatic habit, and a calculated density of 4.83 g/cm3. It is opaque with reflectance and color similar to those of sphalerite. The strongest eight lines of the X-ray powder diffraction pattern [d in Å (I) (hkl)] are 3.103(78)(021), 2.934(89)(21̅2), 2.785(67)(013), 2.679(48)(022), 2.403(50)(211), 2.190(100)(212), 1.934(53)(213), and 1.438(63)(140). The empirical formula, derived from electron-microprobe analysis and the crystal structure, is Ba1.05(Ti1.31V4+0.69)Σ2.00(V3+11.06Fe3+0.49Cr0.34)Σ11.89Si2.06O27 based on O = 27. The crystal structure was solved by direct methods and refined on the basis of F02 using all unique reflections measured with MoKα Xradiation on a CCD-equipped diffractometer. The final R factor was 3.2%, calculated using 659 unique observed reflections. The unit cell contains four layers of two types parallel to (001): X, an octahedral and tetrahedral sheet, and Y, an octahedral plus barium sheet; both layers are doubled through inversion centers resulting in the sequence XXYY... Two consecutive equivalent layers are interconnected through shared octahedral edges, whereas consecutive non-equivalent layers are linked through shared corners. The high calculated density is consistent with the dense packing of the structure.
© 2015 by Walter de Gruyter Berlin/Boston
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