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CaCO3.H2O
Hexagonal
Monohydrocalcite, a calcium carbonate hydrate mineral, was reported by Dunn (1979c) from Sterling Hill; it has not been found at Franklin. It occurs as light green to light yellow-green rounded masses up to several cm in size (resembling drippings) with an internal fibrous texture, encrusting calcite. It resembles hyalite opal at first glance.
Monohydrocalcite was verified using X-ray powder diffraction methods and microprobe analysis which showed only Ca, with no Mg, Fe, Mn, or Zn present in detectable amounts. It is fluorescent in longwave and shortwave ultraviolet with a green color. It is a post-mining mineral which occurs as a dripstone on the walls of adits and shafts.
A second occurrence was reported from Sterling Hill by Jenkins (1994) who described it as white, microbotryoidal crusts on calcite and epidote.
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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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