• Bismuthinite with Wood Tin, Chalcopyrite and Quartz
  • Bismuthinite with Wood Tin, Chalcopyrite and Quartz
  • Bismuthinite with Wood Tin, Chalcopyrite and Quartz
  • Bismuthinite with Wood Tin, Chalcopyrite and Quartz
  • Bismuthinite with Wood Tin, Chalcopyrite and Quartz
  • Bismuthinite with Wood Tin, Chalcopyrite and Quartz
  • Bismuthinite with Wood Tin, Chalcopyrite and Quartz
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Bismuthinite with Wood Tin, Chalcopyrite and Quartz

ID: CC16342
A stunning museum quality specimen of long acicular needles of the bismuth sulphide Bismuthinite which spans large voids in a vuggy skeletal framework of etched milky-Quartz. From the Fowey Consols mine at Tywardreath, in the St. Austell District of Cornwall, England, the deeply striated metallic silver needles of Bismuthinite are commonly encrusted with sooty-black crystals of Cassiterite against a backdrop of massive, brassy-golden Chalcopyrite intermixed with the Quartz. In places where a cross-section of the Cassiterite coating can be studied (using a microscope), this crust is seen to have a radial form emanating from the c-axis of the Bismuthinite crystals, so forming a deposit of very finely crystallised tan-brown Cassiterite of the variety known as “Wood Tin”. The Bismuthinite crystals attain around 2.7 cm in length and richly pervade the vugs in all parts of the specimen.  A wonderful and mineralogically fascinating specimen of Bismuthinite and “Wood Tin” from the classic Cornish locality of Fowey Consols.

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Details

Dimensions
9.8 × 6.8 × 4.9 cm
Categories
Oxides and Hydroxides, Sulphides, Sulphosalts and Arsenides
Locality
Fowey Consols, Tywardreath, St. Austell District, Cornwall, England

Minerals on Specimen

Minerals on specimen
Chalcopyrite, Quartz

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