amorphous
Opal
SiO2.nH2O
Quick Facts
Hardness
5.5
Specific Gravity
1.98
Refractive Index
1.37
Crystal Structure
amorphous[none]:{} amorphous
none
Physical Properties
Crystal Systemamorphous
Hardness (Mohs)5.5
Specific Gravity1.98
CleavageNone
FractureConchoidal
LustreVitreous to resinous
Optical Properties
Refractive Index1.37
PleochroismNone (amorphous)
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Open in Playground amorphous[none]:{} Synthetics & Simulants
Known synthetic and simulant versions of Opal
Related Minerals
Other minerals in the amorphous system
