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Dravite
Dravite

Dioptase
Dioptase



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Dravite
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Dioptase

Dravite and Dioptase Optical Properties

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Optical Properties

Luster

Vitreous
Vitreous

Pleochroism

Very strong: pale yellow colorless
Weak; dark emerald green

Dispersion

0.020.04
0.005 1
👆🏻

Transparency

Transparent
TranslucentHerve Nicolas Lazzarelli

Refractive Index

1.614-1.6661.644-1.720
1 3.25
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Optic Character

-
-

Crystal System

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

Birefringence

0.014-0.0320.051-0.053
0 0.296
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Clarity

Transparent
TranslucentHerve Nicolas Lazzarelli

Dravite and Dioptase Optic Character

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

Similar to their colors, Dravite and Dioptase 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.