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Scheelite and Covellite Optical Properties


Covellite and Scheelite Optical Properties


Optical Properties

Luster
Vitreous, Adamantine   
Resinous   

Pleochroism
Definite dichoric in yellow (yellow to orange-brown)   
Marked   

Dispersion
0.04   
12
Not Available   

Transparency
Translucent, Transparent   
OpaqueAnthony et al, Handbook of mineralogy (2001) More from other references   

Refractive Index
1.918-1.936   
1.45-2.62   

Optic Character
Not Available   
Not Available   

Crystal System
tetragonal   
Hexagonal   

Birefringence
0.016   
Not Available   

Clarity
Translucent   
OpaqueAnthony et al   

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Scheelite and Covellite Optic Character

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

Similar to their colors, Scheelite and Covellite 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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