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(Cu,Zn)2(CO3)(OH)2
Monoclinic
Rosasite, a copper zinc carbonate hydroxide mineral, was reported from Franklin by Cook (1973) as tiny blue-green spherules on hemimorphite which, with goethite, line cavities in iron-oxide-stained calcite. It was found on the 200 level in the 740 pillar at Franklin; this is near the site of the azurite crystals studied by Palache (1928a, 1935). Several specimens at Harvard University were verified subsequently by the writer employing X-ray and microprobe analytical procedures. Material intimately associated with hemimorphite has a Cu:Zn ratio of 65:35, and material free from such hemimorphite has a Cu:Zn ratio of 8:2. Rosasite was confirmed from Sterling Hill by Jenkins and Misiur (1994); they found it associated with malachite and aurichalcite from below the 700 level.
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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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