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KFe3+4(AsO4)3(OH)4.6-7H2O
Cubic
Pharmacosiderite, a potassium ferric-iron arsenate hydroxide hydrate mineral, was found in moderate abundance near the 340 level at Sterling Hill and later near the 180 level. It occurs as minute 0.3-0.8 mm cubic crystals, light green to light yellow, with a vitreous luster. Yellowish brown druses were locally abundant. It was verified by the writer in 1973 employing only X-ray methods; it has not been chemically analyzed. Pharmacosiderite occurs associated with sphalerite, koettigite, legrandite, ogdensburgite, and other arsenates. Material containing much barium, strontium, and lead is discussed under barium-pharmacosiderite.
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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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