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X-Ray and Optical Data for a Vanadium-rich Dravite from Silver Knob, Mariposa County, California, U.S.A.

Published online by Cambridge University Press:  10 January 2013

Franklin F. Foit Jr.
Franklin F. Foit Jr.
Affiliation:
Department of Geology, Washington State University, Pullman, Washington 99164, U.S.A.
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Abstract

X-ray powder diffraction and optical data are presented for a vanadium-rich dravite from Silver Knob, Mariposa County, California, U.S.A. The limited compositional variability observed for vanadium-rich dravite is due to the presence of a Tschermaks substitution whereby the substitution of Al for Si in the tetrahedral ring is charge balanced by trivalent for divalent cation substitution in the octahedral sites in the structure. Vanadium-rich dravite is uniaxial negative with ε = 1.646(2) and ω = 1.676(2). Refined unit cell dimensions are a = 15.9599(10) and c = 7.1889(2); F30 = 111(0.009; 30); M20 = 80; and Dx = 3.07. An indexed X-ray powder diffraction pattern is also presented.

Type
Research Article
Information
Powder Diffraction , Volume 7 , Issue 4 , December 1992 , pp. 236 - 238
Copyright
Copyright © Cambridge University Press 1992

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