Bournonite
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Source volume: 43, issue: 4, PDF page: 64. Label: Figure 73. Bournonite “cogwheel” crystals, 7 cm, from the Herodsfoot mine. Unfortunately the specimen has lost its history. Collection of the Natural History Museum, London (unnumbered), in the Henry Ludlam collec-tion. Roy Starkey photo; copyright The Natural History Museum, London.
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Added on10/22/2024
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- Mineralogical Record Volume: 43, Issue: 4 page 64
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Mineral guide
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steel-gray to black sulfosalt famed for cogwheel twinning and metallic luster; prized by collectors for iconic gears and historic localities.Regional guide
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