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CALCITE
CaCO₃
Photograph of Calcite Sillfoot mine, Cumbria, England

This is a classic example of twinning in which two crystals are joined along a common atomic plane. Because of its distinctive shape this is called a "butterfly" twin.

Size: 8 cm high

Acquired: 1977 donation, Bandy Collection.

Disposition: On display in the Mineral Classics exhibit.

Catalog Number: 18139