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Dravite
Dravite

Grossular
Grossular



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Dravite
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Grossular

Dravite and Grossular Optical Properties

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Optical Properties

Luster

Vitreous
Greasy, Vitreous

Pleochroism

Very strong: pale yellow colorless
None

Dispersion

0.020.02
0.005 1
👆🏻

Transparency

Transparent
-

Refractive Index

1.614-1.6661.730-1.760
1 3.25
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Optic Character

-
-

Crystal System

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

Birefringence

0.014-0.0320.020
0 0.296
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Clarity

Transparent
TransparentUlrich Henn and Claudio C. Milisenda

Dravite and Grossular Optic Character

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

Similar to their colors, Dravite and Grossular 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.