Calcite, (w. Mottramite)

Mineral: Calcite, Mottramite
Chemistry: CaCO3
Size: 126 mm
Owner: Geoff Krasnov
Photographer: Geoff Krasnov

Flattened, modified rhombohedral calcite crystals (to 20 mm), overgrowing a mamillated mass of olive-green mottramite (?). Front and rear views are shown.

The calcite is colourless to white, but with well-developed phantoms in many of the individual crystals.