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Polyhalite
Polyhalite

Sardonyx
Sardonyx



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Polyhalite
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Sardonyx

Optical Properties

Luster

Vitreous, Resinous
-

Pleochroism

-
-

Dispersion

0.020.01
0.005 1
👆🏻

Transparency

-
Translucent

Refractive Index

1.546-1.5481.530-1.543
1 3.25
👆🏻

Optic Character

-
-

Crystal System

Triclinic
-

Birefringence

0.0210.008-0.010
0 0.296
👆🏻

Clarity

-
Translucent