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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
Twinning Groups, St Austell, Cornwall. July 1991At the end of the First Official Exchange Week, young people from Restormel District Councils twin area Dithmarschen, in Germany, gather before returning home in their coach from St Austell
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