Calcite, (w. Hematite)

Mineral: Calcite, Hematite
Chemistry: CaCO3
Size: 120 mm.
Owner: Geoff Krasnov
Photographer: Geoff Krasnov

This specimen of calcite comprises a rosettiform aggregate of calcite plates, each plate consisting of stepped rhombohdral forms in parallel growth.

For the most part, the calcite is heavily included with minute particles of iron oxide, presumably hematite (?), which accounts for the intense brick-red colour.   Only very localised parts of the calcite remain relatively free of these inclusions (notably on the left-hand side of the specimen as it is orientated in the photograph), and these colourless zones provide an aesthetic contrast.