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Zn5(CO3)2(OH)6
Monoclinic
Hydrozincite, a zinc carbonate hydroxide mineral, was first reported from Franklin by Palache. Frondel (1972) noted its occurrence at Sterling Hill as an alteration of zincite and sphalerite. Local hydrozincite remains largely unstudied. It occurs as thin films and opaque white powdery patches and as white crusts of pearly-lustered platy crystals. It is readily identified by its strong blue fluorescence in shortwave ultraviolet. The solubility of synthetic material was discussed by Takahashi (1960).
At Franklin, Palache (1935) noted hydrozincite associated with calcite as a replacement of sphalerite and pyrite. At Sterling Hill, hydrozincite was noted by Frondel to form as post-mining dripstones. The specimens observed by the writer appear to be formed by the alteration of zincite or possibly sphalerite. It has been found in recent times with calcite and sphalerite on the 1750 level, with adelite on the 800 level, and is not uncommon near altered zincite. An occurrence with oxidized sulfides was described by Jenkins and Misiur (1994).
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| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
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This
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