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Opal
Opal
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Opal
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Optical Properties

Luster

Pleochroism

Dispersion

Transparency

Refractive Index

Optic Character

Crystal System

Birefringence

Clarity

 
Vitreous, Waxy
-
0.01
Translucent, Opaque . May be translucent when backlit on the edges.
1.560-1.594
-
Orthorhombic
0.031
Translucent
 
Vitreous, Pearly
None
0.01
Transparent, Translucent, Transparent to translucent
1.37-1.52
-
Trigonal
-9999
Transparent