Conichalcite with Calcite

$400.00

$40.00 shipping
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Ships from USA

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Tucson, Arizona, USA

7,543 for sale·132 sold

The vivid, almost acid-green colour of this specimen is really eye-catching. This is Conichalcite, a rare calcium copper arsenate hydroxide species which forms a series with Duftite (where lead replaces calcium). Both species are well-known at Tsumeb mine and it is possible that both are present on this specimen, as cross-sections through the vivid green velvety microbotryoidal crusts, exposed on the edges of the specimen, show distinct colour banding when viewed under magnification. A later, partial overgrowth of cream coloured rhombic Calcite crystals adds to its attraction. Ex Kessler Collection.