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Calcite


Mineral: Calcite, Copper, Malachite
Chemistry: CaCO3
Size: 80 mm
Owner: Malcolm Southwood
Photographer: Malcolm Southwood

A large (60 mm) rhombohedral crystal of colourless, and largely transparent calcite, overgrowing a "sprig" of what appears to have been native copper, but which is now almost completely replaced by malachite.

The specimen was figured in the "Calcite" edition of extraLapis, (No.4) as a textbook example of this simplest of calcite habits - consisting of only the unit rhombohedron {10-11}.