Calcite. From North Wheal Friendship, Mary Tavy, Tavistock, Devon. James Wickett collection. 

Calcite. From South Crofty Mine, Illogan, Cornwall. Richard Barstow collection. 

Calcite. From Botallack Mine, St Just in Penwith, Cornwall. 

Calcite. From Padstow, Cornwall. 

Calcite. From Cornwall.

Calcite. From Geevor Mine, St Just in Penwith, Cornwall. Richard Barstow collection. 

Calcite. From Levant Mine, St Just in Penwith, Cornwall. W. Peters collection. 

Calcite. From Herodsfoot Mine, Lanreath, Cornwall.