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(Ba,K,)(Fe,Mg)3(Si,Al,Fe)4O10(Cl,OH,F)2
Monoclinic
Anandite, a barium iron aluminosilicate hydroxide mineral of the brittle-mica group, was reported from Sterling Hill by Tracy et al. (1987) and Tracy (1991). It was found in a calcite-augite- willemite-gahnite-biotite-sphalerite horizon, but no additional locality data were given. This anandite is compositionally anomalous, being chlorine-rich, with composition: (Ba0.92K0.06Na0.03Ca0.04)(Fe2+2.08Mg0.48Mn0.20 Zn0.32Cr0.01)(Al1.70Ti0.06Fe2+0.05Fe3+0.06Si2.13)O10(Cl1.22F0.16OH0.62). Tracy (1991) provided additional analytical data on Ba-containing micas from Sterling Hill.
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| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
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Link
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This
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