Opal Triplet (Cabochon) crystal structure
amorphous composite

Opal Triplet (Cabochon)

SiO2*nH2O between dome cap and 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 (glass-like from dome cap)

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 Doublet (Cabochon)
Opal Doublet (Cabochon)
SiO2*nH2O on dark backing
View all amorphous minerals →

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FundamentalsCrystal SystemsFundamentalsOptical PropertiesFundamentalsPhysical Properties