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Scheelite and Dravite Optical Properties


Dravite and Scheelite Optical Properties


Optical Properties

Luster
Vitreous, Adamantine   
Vitreous   

Pleochroism
Definite dichoric in yellow (yellow to orange-brown)   
Very strong: pale yellow colorless   

Dispersion
0.04   
12
0.02   
22

Transparency
Translucent, Transparent   
Transparent   

Refractive Index
1.918-1.936   
1.614-1.666   

Optic Character
Not Available   
Not Available   

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

Birefringence
0.016   
0.014-0.032   

Clarity
Translucent   
Transparent   

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Scheelite and Dravite Optic Character

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

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Scheelite and Dravite Transparency

Similar to their colors, Scheelite 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, Scheelite is Translucent and Transparent while Scheelite is Translucent and Transparent in appearance.

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Yellow Gemstones


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