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Dravite
Dravite

Amblygonite
Amblygonite



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Dravite
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Amblygonite

Dravite and Amblygonite Optical Properties

Optical Properties

Luster

Vitreous
Vitreous, Pearly

Pleochroism

Very strong: pale yellow colorless
weak to none

Dispersion

0.020.01
0.005 1
👆🏻

Transparency

Transparent
-

Refractive Index

1.614-1.6661.578-1.646
1 3.25
👆🏻

Optic Character

-
Biaxial/+

Crystal System

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

Birefringence

0.014-0.0320.020-0.030
0 0.296
👆🏻

Clarity

Transparent
TransparentUlrich Henn and Claudio C. Milisenda

Dravite and Amblygonite Optic Character

Dravite and Amblygonite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Dravite and Amblygonite 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 Amblygonite 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. Amblygonite has Biaxial/+ character.

Dravite and Amblygonite Transparency

Similar to their colors, Dravite and Amblygonite 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.