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Blue John
Blue John
☒

Grandidierite
Grandidierite
☒



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Blue John
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Grandidierite
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Optical Properties

Luster

Pleochroism

Dispersion

Transparency

Refractive Index

Optic Character

Crystal System

Birefringence

Clarity

 
-
-
0.02
Transparent
1.432-1.436
-
-
-9999
Transparent
 
Vitreous, Pearly
visible
0.04
-
1.578-1.639
-
Orthorhombic
0.037-0.039
-

Compare Blue Gemstones

Blue Gemstones

Chrome Tourmaline
Chrome Tourmaline
Common Opal
Common Opal
Cordierite Iolite
Cordierite Iolite
Grandidierite
Boulder Opal
Grandidierite Vs Boulder Opal
Grandidierite
Brucite
Grandidierite Vs Brucite
Grandidierite
Caledonite
Grandidierite Vs Caledonite

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