Natrolite. From Dean Quarry, St. Keverne, Cornwall.

Gabbro boulder. From Coverack, Cornwall. Roger Penhallurick collection.

Analcime on calcite on serpentinized greenstone. From Dean Quarry, St. Keverne, Cornwall.

Natrolite coated with stilbite. Dean Quarry, St. Keverne, Cornwall.

Golden chabazite with clear calcite. From Dean Quarry, St. Keverne, Cornwall. Rev. Holyer collection.

Prehnite. From Dean Quarry, St. Keverne, Cornwall. Rev. Holyer collection.

Prehnite on gabbro. From Dean Quarry, St. Keverne, Cornwall.

Native copper coated in malachite. From Trenance, Mullion, Cornwall.

Hornblende schist. From Traboe, Porthoustock, Cornwall. Roger Penhallurick collection.

Dolerite or black dyke. From Coverack, Cornwall. Roger Penhallurick collection.

Mica schist. From Polpeor Cove, Landewednack, Cornwall. Roger Penhallurick collection.

Hornblende schist. From Church Cove, Landewednack, Cornwall. Roger Penhallurick collection.

Steatite or soapstone. From Gew Graze, Mullion, Cornwall.

Troctolite boulder. From Coverack, Cornwall. Roger Penhallurick collection.

The acid granite component of Kennack gneiss. From Kennack, St. Keverne, Cornwall. Roger Penhallurick collection.

Treleague quartzite. From Trembraze, St. Keverne, Cornwall. Roger Penhallurick collection.

Pectolite in gabbro. From Dean Quarry, St. Keverne, Cornwall. Roger Penhallurick collection.