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Mineralogical ClassificationZoltaiite (IMA 2003-006) published

9th Sep 2005 14:35 UTCJim Ferraiolo

Am Min 90,1655-1660(2005)



ABSTRACT

Zoltaiite, ideal formula BaV24+V3+12Si2O27, space group P3–, 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 reß ectance and color similar to those of sphalerite. The strongest eight

lines of the X-ray powder diffraction pattern are 3.103(78)(021), 2.934(89)(21–2), 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 reÞ ned on the basis of F0

2 using all unique reß ections measured with MoKα X-

radiation on a CCD-equipped diffractometer. The Þ nal R factor was 3.2%, calculated using 659 unique

observed reß ections. 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.
 
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