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Opal

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GFM1015331

Opal

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Description Tabs

Description
Locality: 
Butte County, California, United States of America
Class: 
Single Crystal
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.5 × 2.5 × 2 cm
Description

Intensely colored light orange-brown to almost black glassy aggregates with a fibrous structure and growth rings. Interesting display specimens from a very limited new find. Gem-quality opalized wood is something really rare.

Mineral Data
What's on the rock

Opal

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