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Opal

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ESM890001

Opal

Description Tabs

Description
Locality: 
(Antananarivo Province), Madagascar
Class: 
Crystal Group/Cluster
Size Range: 
Museum (18cm plus)
Size: 
18 × 17 × 13 cm
Description

A large greenish-brown opal specimen

Mineral Data
What's on the rock

Opal

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