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Zn2(AsO4)(OH).H2O
Monoclinic
Legrandite, a zinc arsenate hydroxide hydrate mineral, was found on the 340 level at Sterling Hill, and verified using X-ray methods, which are suggested for identification. No physical, optical, or chemical data have been published.
Legrandite occurred as deep yellow to light yellow to colorless, flattened, splayed aggregates of lustrous, prismatic crystals, in a habit similar to that of koettigite, with crystal curvature commonly visible in the composite aggregate, and forming continuous, albeit thin, sheets of material coating many square cm of vein surfaces. Some aggregates were 3-4 mm thick, deep yellow, and slightly waxy in luster. Associated minerals are predominantly koettigite and pharmacosiderite, but small amounts of the associated species listed under koettigite are also found.
Legrandite was found again, some 5 years later, near the 180 level, where it is much more abundant, occurring in sparse euhedral crystals to several mm, and is associated with koettigite and pharmacosiderite. 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
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This
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