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Chalcopyrite with Quartz and Minor Sphalerite, United KingdomThis specimen was drawn for Specimens of British Minerals, Selected from the Cabinet of Philip Rashleigh (1797, Volume 1, Plate 7, Figure 3) which states Is yellow copper ore
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