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Opal

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SUR30208

Opal

ex M.J. Spencer collection

Description Tabs

Description
Locality: 
Gunheath Pit, St Austell, Cornwall, United Kingdom
Size Range: 
Cabinet (10-18 cm)
Size: 
11 × 7 × 6 cm
Description

Translucent masses of opal distributed throughout the matrix.

Grey blue to white colouration from included matter.

Nice waxy lustre.

Mineral Data
What's on the rock

Opal

Formula: 
SiO2·nH2O
Strunz: 
4.DA.10
Hardness: 
5.5 - 6.5
Streak: 
White
Surrey Minerals