Opal Doublet (Cabochon) crystal structure
amorphous composite

Opal Doublet (Cabochon)

SiO2*nH2O on dark backing

Quick Facts

Hardness
5.5
Specific Gravity
1.9
Refractive Index
1.44

Crystal Structure

amorphous

Physical Properties

Crystal Systemamorphous
Hardness (Mohs)5.5
Specific Gravity1.9
LustreVitreous to resinous

Optical Properties

Refractive Index1.44

Origin & Identification

Origincomposite

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Natural Counterpart

The natural gem this composite imitates

Opal
Opal natural
SiO2.nH2O

Related Minerals

Other minerals in the amorphous system

Gilson Opal (Cabochon)
Gilson Opal (Cabochon)
SiO2*nH2O
Glass (Paste) (Faceted)
Glass (Paste) (Faceted)
SiO2 + various metal oxides (lead, barium)
Opal
Opal
SiO2.nH2O
Opal Triplet (Cabochon)
Opal Triplet (Cabochon)
SiO2*nH2O between dome cap and dark backing
View all amorphous minerals →

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FundamentalsCrystal SystemsFundamentalsOptical PropertiesFundamentalsPhysical Properties