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Hibschite
Hibschite

Dravite
Dravite



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Hibschite
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Dravite

Hibschite and Dravite Optical Properties

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Optical Properties

Luster

Vitreous
Vitreous

Pleochroism

-
Very strong: pale yellow colorless

Dispersion

0.020.02
0.005 1
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Transparency

Semitransparent
Transparent

Refractive Index

-99991.614-1.666
1 3.25
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Optic Character

-
-

Crystal System

Isometric Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: I a3d
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m

Birefringence

-99990.014-0.032
0 0.296
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Clarity

TranslucentAnthony et al
Transparent

Hibschite and Dravite Optic Character

Hibschite and Dravite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Hibschite and Dravite 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 Hibschite and Dravite 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.

Hibschite and Dravite Transparency

Similar to their colors, Hibschite and Dravite 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, Hibschite is Semitransparent while Hibschite is Semitransparent in appearance.