Calcite
Wheal Wrey, Wrey and Ludcott United Mines, St Ive, Cornwall, England, UK
Large grayish-white calcite crystals with an unusual morphology, scattered among countless smaller crystals. The size of the specimen is approximately 30 cm, estimated from outside the display case. The label reads "Rhombohedral crystals of prismatic appearance."
Specimen is on display in the Natural History Museum, London, #32890.
Photo ...
© R. Van Dommelen