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Scheelite and Astrophyllite Optical Properties


Astrophyllite and Scheelite Optical Properties


Optical Properties

Luster
Vitreous, Adamantine   
Greasy, Pearly   

Pleochroism
Definite dichoric in yellow (yellow to orange-brown)   
Strong: X= deep red-orange Y= orange-yellow Z= lemon-yellow   

Dispersion
0.04   
12
Not Available   

Transparency
Translucent, Transparent   
Translucent   

Refractive Index
1.918-1.936   
1.678-1.758   

Optic Character
Not Available   
Not Available   

Crystal System
tetragonal   
Triclinic   

Birefringence
0.016   
0.050   

Clarity
Translucent   
Translucent   

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Scheelite and Astrophyllite Optic Character

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

Similar to their colors, Scheelite and Astrophyllite 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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