Sulfosalt Collection

Trechmannite
A red crystal of trechmannite comprised of (silver arsenic sulphide). A specimen from the collections of the Natural History Museum, London

Jamesonite comprises of lead iron antimony sulphide, and is characterized by hair-like fibrous crystals. This specimen is from the collections held at the Natural History Museum, London

Cobaltite

Boulangerite comprises of (lead antimony sulphide) and is characterized by fine, fibrous crystals. This specimen is from the Natural History Museum, London

Stephanite

Bournonite or cog-wheel ore comprises of (copper lead antimony sulphide). Cog wheel ore contains the mineral chromite, though it is difficult to extract from crystals

Tennantite
Crust of sparkling silvery metallic examples of tennanite (copper arsenic sulphide) some partly altered by copper rust in cavity in matrix. Specimen from Relistan mine, Cornwall

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