Calcite, (w. Malachite)

Mineral: Calcite, Malachite
Chemistry: CaCO3
Size: 93 mm
Owner: Geoff Krasnov
Photographer: Geoff Krasnov

A group of flattened rhombohedral calcite crystals, off-white in colour, is sprinkled with numerous tiny spherical aggregates of malachite.   The calcite has an unusual porcelaneous lustre that appears to have been modified by natural etching prior to the crystallisation of the malachite. 

(Photograph 2 FOV c. 40 mm.)