Calcite, (on Mottramite)

Mineral: Calcite, Mottramite
Chemistry: CaCO3
Size: 80 mm
Owner: Mariusz Oleszczuk
Photographer: Mariusz Oleszczuk

An unusual specimen comprising a coarsely crystalline aggregate of colourless-white calcite, almost completely encrusting a hollow tube of mottramite (?) which is best seen at the base of the structure (see Photograph 2; FOV 30 mm).