CLAUSTHALITE with CALCITE

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Clausthalite is a rare lead selenide (PbSe) and on this small cabinet specimen forms granular metallic patches sparsely distributed through a massive milky white Calcite matrix. Th e largest patch of Clausthalite measures 7 x 3 mm and all occurrences are metallic black, often with a slight iridescent blue sheen. The Calcite surrounding the Clausthalite is partly crystallised, displaying occasional prism faces. The Calcite covers the top surface of a black and earthy carmine basaltic looking matrix. A rather lovely old German label accompanies this specimen, written in a beautiful, yet now somewhat faint, copperplate hand. Show more