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Ca4Mg(AsO3OH)2(AsO4)2.11H2O
Triclinic
Picropharmacolite, a calcium magnesium arsenate hydrate mineral, was described from Sterling Hill by Dunn (1979c). It occurs as a post-mining mineral on the walls of shafts over 30 years old and has been found at a number of places in the mine. It is white and occurs as 1 cm fan-like arrays of silky acicular crystals on calcite. It was verified using X-ray methods and microprobe analysis; a partial analysis is given in Table 25, correcting the erroneous MgO value given by Dunn (1979c). Picropharmacolite fluoresces with a moderate to weak white color in shortwave and longwave ultraviolet. It is best verified using X-ray methods. It has not been reported 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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