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Blue John
Blue John
☒

Feldspar
Feldspar
☒



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Blue John
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Feldspar
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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
None
0.01
Transparent, Translucent
1.518-1.570
-
Triclinic or monoclinic
0.008-0.010
Transparent

Compare Blue Gemstones

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Common Opal
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Boulder Opal
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Feldspar Vs Brucite
Feldspar
Caledonite
Feldspar Vs Caledonite

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