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Opal

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MMM50791

Opal

Description Tabs

Description
Locality: 
Gunheath Pit, St Austell, Cornwall, United Kingdom
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.5 × 4 × 3 cm
Description

Nice piece of translucent opal from the Gunheath clay quarry, St. Austell.

Mineral Data
What's on the rock

Opal

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