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Cassiterite & Wolframite

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TMT212498

Cassiterite & Wolframite

Self collected, South Crofty, Geology Department

Description Tabs

Description
Locality: 
South Crofty Mine, Pool, Carn Brea, Cornwall, United Kingdom
Size Range: 
Miniature (4.5-7 cm)
Size: 
3.5 × 5 × 2.4 cm
Description

Dark brownish crystalline cassiterite with black bladed wolframite, in part altered to scheelite. Rare location specimen, collected from a lens-like structure within the lode.

Mineral Data
What's on the rock

Cassiterite

Formula: 
SnO2
Strunz: 
4.DB.05
Crystal System: 
Tetragonal
Hardness: 
6.0 - 7.0

Wolframite

Synonym Of: 

Hübnerite

Formula: 
MnWO4
Strunz: 
4.DB.30
Hardness: 
4.0 - 4.5

Ferberite

Formula: 
FeWO4
Strunz: 
4.DB.30
Hardness: 
4.0 - 4.5
Formula: 
(Fe2+)WO4 to (Mn2+)WO4
Crystal System: 
Monoclinic
Hardness: 
4 - 4.5
Colour: 
Greyish-black
Streak: 
Reddish Brown
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