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Cassiterite Psm Orthoclase

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UVM694692

Cassiterite Psm Orthoclase

Willard Perkins
Classic Locality

Description Tabs

Description
Locality: 
Wheal Coates, St Agnes, Cornwall, United Kingdom
Class: 
Single Crystal
Size Range: 
Thumbnail (1-3cm)
Size: 
2.1 × 1.1 × 0.6 cm
Description

A sharp pseudomorph of cassiterite after orthoclase from the classic finds at Wheal Coates from the late 1820's.   This specimen shows great form, and was mounted by the creator of the "perky" thumbnail box, Willard Perkins.   

Mineral Data
What's on the rock

Cassiterite

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

Orthoclase

Formula: 
KAlSi3O8
Strunz: 
9.FA.30
Hardness: 
6.0
Streak: 
White

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