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190 results found with "Minerals"

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Diamond

Diamonds are the hardest minerals. This is a ‘boart’ diamond - it is crystalline, fractured and discoloured and is not gem quality....

Malachite and azurite

Donated by Mr SS Bastard. Collected at East Wheal Russel Mine near Tavistock. Copper occurs as green malachite and blue azurite in this specimen. Both minerals form through weathering of...

Limonite

Limonite is an iron hydroxide with a characteristic brownish yellow colour. It commonly forms during alteration of other iron-bearing minerals or rocks....

Copper

Native copper collected at the Lizard, Cornwall and donated by Mrs Berger in 1884....

Cassiterite

Recorded in accessions register as ‘Tin Ore. Dartmoor’. Donated by Mr George Sparke. Collected on Dartmoor....

Gold

Gold donated by WH Reed in 1884....

Gold

Gold donated by WH Reed in 1884....

Pyromorphite

The green crystals are a mineral called pyromorphite. Pyromorphite is a phosphate of Lead. It has formed over a mineral called quartz....

Siderite

Siderite casts such as this are quite unusual. This one is probably from Virtuous Lady Mine in Devon. We have not been able to trace who collected it or when...