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Dravite
Dravite

Prasiolite
Prasiolite



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Prasiolite

Dravite and Prasiolite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous
Vitreous
1.2 Pleochroism
Very strong: pale yellow colorless
Very weak: light green pale greenWalter Schumann
1.3 Dispersion
Albite Optical ..
0.02
Rank: 22 (Overall)
0.01
Rank: 27 (Overall)
Fluorite Optical Properties
1.4 Transparency
Transparent
Transparent, Translucent
1.5 Refractive Index
1.614-1.666
1.544-1.553
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
Trigonal
1.8 Birefringence
0.014-0.032
0.009
1.9 Clarity
Transparent
Transparent

Dravite and Prasiolite Optic Character

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

Similar to their colors, Dravite and Prasiolite 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.