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Cassiterite with Erythrite

#56173

Cassiterite with Erythrite

#56173
Availability
Sold
Size
7 x 8 x 5 cm - Sm Cabinet 
Formula
SnO2 (RRUFF)
Locality
Dolcoath mine, Camborne, Cornwall, England
Tagged
tin

Rich specimen loaded with elongated pointed crystals termed "sparable tin", a crystal habit apparently unique to Cornish cassiterite. The term is derived from "sparable" nails used by cobblers in the soles and heels of shoes for traction. 

This is a cabinet size specimen with the cassiterite crystals reaching 3mm in the many vugs of massive Cassiterite with dark gree Clinochlore(?) rosettes and Quartz crystals. The unusual association is the pink Erythrite.

Cassiterite

Formula
SnO2 
Crystal System
Tetragonal 
Crystal Habit
Prismatic, Massive, Botryoidal 
Cleavage
Perfect, Indistinct, None 
Luster
Adamantine 
Color
brown, brownish black, colorless, green, gray 
Streak
brownish white 
Class
Tetragonal - Ditetragonal Dipyramidal 
Fracture
Irregular 
Hardness
6-7 

Data courtesy of Webmineral.

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