Arsenopyrite. From Cornwall.

Sphalerite on quartz. From Alfred Consols, Phillack, Cornwall. James Wickett collection.

Sphalerite. From Cornwall. James Wickett collection.

Red sphalerite. From Cornwall. James Wickett collection.

Siderite with quartz and iron oxide. From St Day, Cornwall. Philip Rashleigh collection.

Sphalerite, quartz and chalcopyrite. From Wheal Jane, Kea, Cornwall. Manuell collection.

Siderite on quartz. From Cook’s Kitchen, Illogan, Cornwall. James Wickett collection.

Siderite after calcite. From Botallack, St Just, Cornwall. Williams collection.