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Peridot
Peridot

Dravite
Dravite



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Peridot
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Dravite

Peridot and Dravite Optical Properties

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Optical Properties

Luster

Pleochroism

Dispersion

Transparency

Refractive Index

Optic Character

Crystal System

Birefringence

Clarity

 
Vitreous, Greasy
Weak: yellow-green green (colorless)Herve Nicolas Lazzarelli
0.02
Transparent
1.64-1.69
-
Orthorhombic
0.036
Transparent
 
Vitreous
Very strong: pale yellow colorless
0.02
Transparent
1.614-1.666
-
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
0.014-0.032
Transparent

Peridot and Dravite Optic Character

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

Peridot and Dravite Transparency

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