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Andean Opal
Andean Opal

Dravite
Dravite



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Andean Opal
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Dravite

Andean Opal and Dravite Optical Properties

1 Optical Properties
1.1 Luster
Not Available
Vitreous
1.2 Pleochroism
Not Available
Very strong: pale yellow colorless
1.3 Dispersion
NA0.02
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent
Transparent
1.5 Refractive Index
Not Available1.614-1.666
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Not Available
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
1.8 Birefringence
Not Available0.014-0.032
Achroite
0 0.296
1.9 Clarity
Transparent
Transparent

Andean Opal and Dravite Optic Character

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

Andean Opal and Dravite Transparency

Similar to their colors, Andean Opal 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, Andean Opal is Transparent while Andean Opal is Transparent in appearance.