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Dravite
Dravite

Gedrite
Gedrite



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Dravite
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Gedrite

Dravite and Gedrite Optical Properties

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Optical Properties

Luster

Vitreous
Vitreous

Pleochroism

Very strong: pale yellow colorless
Weak to moderate

Dispersion

0.020.02
0.005 1
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Transparency

Transparent
Transparent

Refractive Index

1.614-1.6661.625-1.718
1 3.25
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Optic Character

-
-

Crystal System

Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
Orthorhombic Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma

Birefringence

0.014-0.032-9999
0 0.296
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Clarity

Transparent
Transparent

Dravite and Gedrite Optic Character

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

Similar to their colors, Dravite and Gedrite 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.