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CaFe3+3(AsO4)3O2.3H2O
Monoclinic
Arseniosiderite, a calcium ferric-iron arsenate hydroxide hydrate mineral, was first reported by Palache (1935), but this material was shown by Frondel (1972) and Dunn (1979c) to be a Ca-Mn silicate, later described as the new mineral bostwickite (Dunn and Leavens, 1983).
True arseniosiderite was verified from Sterling Hill, using X-ray diffraction methods and a microprobe scan which confirmed Ca, Fe, and As; Mn and Zn are less than 1 wt. % in such material. This arseniosiderite occurred as a light brown to medium brown, microscopic alteration product of franklinite and loellingite in highly calcic ore. It is best verified using X-ray methods. Arseniosiderite is rare and has not been reported from Franklin.
Several arseniosiderite-like unnamed minerals have been found, mostly at Sterling Hill, but they were of too low a quality to permit definition; some may be mixtures.
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| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
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Link
to homepage
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This
page created: January 11, 2001 |
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