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Cassiterite, Wherry Mine, Wherrytown, Penzance, Cornwall, EnglandCassiterite with quartz. A very rich tin ore of a brown colour with black crystals of a curious form on the surface intermixed with white quartz
Cuprite with Minor Quartz, Gwennap, Cornwall, EnglandThis specimen was drawn for Specimens of British Minerals, Selected from the Cabinet of Philip Rashleigh (1797, Volume 1, Plate 16)
Cassiterite, Ulu Johan, Ipoh, Kinta district, Southern Perak, MalaysiaThis large specimen of water worn cassiterite was brought to Cornwall from Malaysia by Redruth businessman James Wickett in 1910
Hematite, Buxton, EnglandMassive, compact, water worn hematite, dark red in colour. The specimen label states Iron Ore, the best pieces are used for burnishing when polished - from Buxton or thereabouts
Goethite with Calcite, Forest of Dean, Gloucestershire, EnglandStalactitic goethite with colourless calcite crystals. This variety of goethite, known as brush ore, was high quality iron ore from the Forest of Dean, often containing between 60-65% iron
Manganite, Warwickshire, EnglandAcicular manganite crystals on massive manganite. Manganite, which is a valuable manganese ore, was worked at Nuneaton and Hartshill in Warwickshire by the Cornish Mining Company from around 1820 to
Cassiterite, Wheal Maudlin, Lostwithiel (formerly in Lanlivery Parish), Cornwall, EnglandA superb twinned crystal of cassiterite. In Cornwall, cassiterite is concentrated in hydrothermal veins and pegmatites associated with granite intrusions
Cassiterite Partly Replacing Orthoclase, Wheal Coates, St Agnes, Cornwall, EnglandTwinned crystals of orthoclase feldspar partially replaced by cassiterite. This rare kind of replacement, or partial pseudomorph, is best seen in specimens from Wheal Coates
Cassiterite, St Agnes, Cornwall, EnglandLarge crystals of cassiterite, varying from black to dark brown in colour. In Cornwall, cassiterite is concentrated in hydrothermal veins and pegmatites associated with granite intrusions