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Pumpellyite and Proustite Optical Properties


Proustite and Pumpellyite Optical Properties


Optical Properties

Luster
Fibrous   
Adamantine   

Pleochroism
Not Available   
Moderate; cochineal-red to blood-red   

Dispersion
Not Available   
Not Available   

Transparency
Gemmological Tables (2004)   
OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) Rarely transparentMore from other references   

Refractive Index
1.674-1.764   
2.792-3.087   

Optic Character
Not Available   
Not Available   

Crystal System
monoclinic   
Trigonal   

Birefringence
0.014-0.016   
0.295-0.296   

Clarity
OpaqueUlrich Henn and Claudio C. Milisenda   
OpaqueUlrich Henn and Claudio C. Milisenda   

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Pumpellyite and Proustite Optic Character

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

Similar to their colors, Pumpellyite and Proustite 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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