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Home Science Geology

GeoPicture of the week: Crocoite from Tasmania

by Mihai Andrei
October 3, 2012
in Geology, GeoPicture
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Crocoite is a fairly rare mineral in many parts of the world, consisting of lead chromate, PbCrO4. The relative rareness comes from the way it forms: it requires an oxidation zone of lead ore bed and presence of what are called ultramafic rocks, which act as a source of chromium. Ultramafic rocks are 90% mafic minerals (dark colored, high magnesium and iron content) – the mantle is composed of such rocks.

Tags: crocoiteGeoPicturemineral

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