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Bournonite with Quartz, Herodsfoot Mine, Lanreath, Cornwall, EnglandSteel-grey twinned bournonite crystals, in distinctive cog wheel formation, with colourless quartz. This fine specimen from the lead and silver mine, Herodsfoot
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, 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