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Pumpellyite and Cassiterite Optical Properties


Cassiterite and Pumpellyite Optical Properties


Optical Properties

Luster
Fibrous   
Adamantine, Greasy   

Pleochroism
Not Available   
Pleochroic haloes have been observed. Dichroic in yellow   

Dispersion
Not Available   
0.07   
6

Transparency
Gemmological Tables (2004)   
Transparent, Translucent   

Refractive Index
1.674-1.764   
1.990-2.105   

Optic Character
Not Available   
Not Available   

Crystal System
monoclinic   
tetragonal   

Birefringence
0.014-0.016   
0.096-0.098   

Clarity
OpaqueUlrich Henn and Claudio C. Milisenda   
Transparent   

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Pumpellyite and Cassiterite Optic Character

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

Similar to their colors, Pumpellyite and Cassiterite 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, Pumpellyite is Gemmological Tables (2004) while Pumpellyite is Gemmological Tables (2004) in appearance.

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