Calcite, (w. Mottramite)

Mineral: Calcite, Mottramite
Chemistry: CaCO3
Size: 43 mm
Owner: Mariusz Oleszczuk
Photographer: Mariusz Oleszczuk

A stacked aggregate of water-clear, translucent, flattened "nailhead" calcite rhombs (to 15 mm), partly overgrowing a complex, arborescent spray of mottramite (?) dendrites.  (The mottramite has not been analysed, but the habit is highly characteristic.)

The specimen was formerly in the collection of Art Soregaroli (Canada).