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Opal

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MGR876523

Opal

Floater

Description Tabs

Description
Locality: 
Mintabie, North West Province, South Australia, Australia
Class: 
Single Crystal
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 1.4 × 1.1 cm
Description

Here we have a wonderful so calles seam opal from Australia. They call it seam opal because it is formed by silica-rich water running through seams and cracks in the earth.

Mineral Data
What's on the rock

Opal

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