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Alexandrite
Alexandrite

Carnallite
Carnallite



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Alexandrite
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Carnallite

Optical Properties

Luster

Vitreous
Greasy

Pleochroism

-
-

Dispersion

0.020.02
0.005 1
👆🏻

Transparency

Transparent, Transparent to nearly opaque
-

Refractive Index

1.739-1.7701.467
1 3.25
👆🏻

Optic Character

Biaxial/+
-

Crystal System

Orthorhombic
Orthorhombic

Birefringence

0.007-0.0100.0270
0 0.296
👆🏻

Clarity

Transparent
-