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Grossular Garnet
Grossular Garnet
☒

Cordierite Iolite
Cordierite Iolite
☒



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Cordierite Iolite
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Optical Properties

Luster

Pleochroism

Dispersion

Transparency

Refractive Index

Optic Character

Crystal System

Birefringence

Clarity

 
Vitreous, Adamantine
-
0.03
Transparent
1.738-1.745
-
Isometric
-9999
Transparent
 
Vitreous
Strong trichroism: colorless to yellowish
0.02
Transparent
1.542-1.578
Biaxial/+
-
0.008-0.012
Transparent

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