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Ca5(AsO3OH)2(AsO4)2.9H2O Monoclinic
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| Figure 25-27. Prismatic guerinite crystals from Sterling Hill. Field of view is 1.5 mm in maximum dimension. | ||
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Guerinite, a calcium arsenate hydrate mineral, was described by the writer (The Picking Table, 22, #1, p.2) from Sterling Hill, where it occurs as a post-mining mineral in shafts over 30 years old. Guerinite occurs as opaque, white, pearly-lustered aggregates of 1-3 mm prismatic crystals (Figure 25-27). It was identified using X-ray methods, which are suggested for verification. Guerinite fluoresces with a weak white color in shortwave and longwave ultraviolet (Bostwick, 1982). It formed on white calcite which contained small amounts of arsenopyrite, realgar, and graphite. It is not known from Franklin.
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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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