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Mn5(AsO3OH)2(AsO4)2.4H2O Monoclinic
Villyaellenite, a manganese arsenate hydrate mineral, was verified by the writer from Sterling Hill and published by Kampf and Ross (1988). Villyaellenite occurs as flattened, 7 mm wide, radial sprays of light pink crystals with vitreous luster. There is no response to ultraviolet. No other physical or optical data exist. A microprobe analysis is given in Table 25, showing minimal Mn/Ca solid solution. X-ray methods are suggested for verification.
Villyaellenite is known on but one specimen from the 340 level. It occurs with manganoan calcite in a vein in willemite/franklinite ore. The 340 level is one which contributed mostly Fe and Zn arsenates, so this occurrence is anomalous.
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| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
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