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Dravite
Dravite

Omphacite
Omphacite



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Dravite
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Omphacite

Dravite and Omphacite Optical Properties

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Optical Properties

Luster

Vitreous
Vitreous

Pleochroism

Very strong: pale yellow colorless
Weak: colorless -- very pale green -- very pale green

Dispersion

0.020.02
0.005 1
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Transparency

Transparent
TranslucentAnthony et al

Refractive Index

1.614-1.6661.662-1.723
1 3.25
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Optic Character

-
-

Crystal System

Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
-

Birefringence

0.014-0.032-9999
0 0.296
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Clarity

Transparent
TranslucentAnthony et al

Dravite and Omphacite Optic Character

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

Dravite and Omphacite Transparency

Similar to their colors, Dravite and Omphacite 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, Dravite is Transparent while Dravite is Transparent in appearance.