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Alexandrite
Alexandrite

Hematite
Hematite



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Alexandrite
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Hematite

Alexandrite and Hematite Optical Properties

Optical Properties

Luster

Vitreous
-

Pleochroism

-
O = brownish red; E = yellowish red

Dispersion

0.020.05
0.005 1
👆🏻

Transparency

Transparent, Transparent to nearly opaque
OpaqueHerve Nicolas Lazzarelli

Refractive Index

1.739-1.7702.690-3.220
1 3.25
👆🏻

Optic Character

Biaxial/+
-

Crystal System

Orthorhombic
Trigonal

Birefringence

0.007-0.0100.280
0 0.296
👆🏻

Clarity

Transparent
OpaqueHerve Nicolas Lazzarelli

Alexandrite and Hematite Optic Character

Alexandrite and Hematite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Alexandrite and Hematite Physical Properties like crystallographic symmetry, pleochroism,etc. in the crystal. Some of the optical properties are refractive index, luster, optic character, pleochroism etc. Prominent among these is Alexandrite and Hematite optic character. You might have noticed your gemologist rotating the gemstone while testing it. Rotating a gemstone along its optic axis helps in determining its optic character. Alexandrite has Biaxial/+ character.

Alexandrite and Hematite Transparency

Similar to their colors, Alexandrite and Hematite transparency can also be used as criteria for their primary identification. Although transparency cannot be the only criteria for gemstone identification, it can efficiently used in gemstone grading. Talking about their transparency, Alexandrite is Transparent and Transparent to nearly opaque while Alexandrite is Transparent and Transparent to nearly opaque in appearance.