Milky Quartz. From Hendra Pit, St Dennis, Cornwall. 

Amethyst Quartz. From Parsons Park Clay Pit, St Neot, Cornwall. Richard Barstow collection. 

Quartz. From St Austell, Cornwall. 

Opal. From Old Cleaves China Clay Pit, Bugle, Cornwall. 

Opal. From Slip China Stone Works, Treviscoe, Cornwall. Courtenay Smale collection. 

Cacholong Opal. From Bugle, Cornwall. James Wickett collection. 

Muscovite. From Stennagwyn Mine, St Austell, Cornwall. 

Fluorapatite. From Bunny Mine, Bugle, Cornwall. Richard Barstow collection. 

Kaolinite. From Rostowrack China Clay Quarry, St Dennis, Cornwall. Courtenay Smale collection. 

Orthoclase Feldspar. ‘Pigs Eggs’. From St Austell, Cornwall. James Wickett collection. 

Engine house at Bunny Mine, with clay tip in the background. 1960s.

Amethyst Quartz. From Rostowrack China Clay Quarry, St Dennis, Cornwall. Richard Barstow collection. 

Cassiterite crystals. From Beam Mine, Roche, Cornwall.

Fluorapatite. From Stennagwyn Mine, St Austell, Cornwall. 

Fluorapatite. From Stennagwyn Mine, St Austell, Cornwall. 

Stannite. From Bunny Mine, Bugle, Cornwall. Richard Barstow collection. 

Cassiterite crystals. From Beam Mine, Roche, Cornwall.

Turquoise. From Gunheath China Clay Works, Carthew, Cornwall. D. Sparks collection. 

Amethyst Quartz. From Virginia Clay Pit, Treviscoe, Cornwall. Courtenay Smale collection. 

Quartz. From St Stephen in Brannel, Cornwall. 

Amethyst Quartz. From Goonvean China Clay Pit, Treviscoe, Cornwall. Courtenay Smale collection. 

Quartz. From Little Johns Pit, St Austell, Cornwall. 

Amethyst Quartz. From North Goonbarrow Clay Pit, Bugle, Cornwall. Vincent Holyer collection.