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Cassiterite and Corundum Optical Properties


Corundum and Cassiterite Optical Properties


Optical Properties

Luster
Adamantine, Greasy   
Adamantine, Vitreous   

Pleochroism
Pleochroic haloes have been observed. Dichroic in yellow   
None   

Dispersion
0.07   
6
0.02   
21

Transparency
Transparent, Translucent   
Transparent, Translucent   

Refractive Index
1.990-2.105   
1.758-1.780   

Optic Character
Not Available   
Not Available   

Crystal System
tetragonal   
Trigonal   

Birefringence
0.096-0.098   
0.007-0.010   

Clarity
Transparent   
Gemmological Tables (2004) More from other references   

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Cassiterite and Corundum Optic Character

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

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

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