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Neptunite and Proustite Optical Properties


Proustite and Neptunite Optical Properties


Optical Properties

Luster
Vitreous   
Adamantine   

Pleochroism
x=yellow-orange   
Moderate; cochineal-red to blood-red   

Dispersion
Not Available   
Not Available   

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

Refractive Index
1.692-1.734   
2.792-3.087   

Optic Character
Not Available   
Not Available   

Crystal System
monoclinic   
Trigonal   

Birefringence
0.0294-0.0452   
0.295-0.296   

Clarity
Translucent   
OpaqueUlrich Henn and Claudio C. Milisenda   

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Neptunite and Proustite Optic Character

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

Similar to their colors, Neptunite 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, Neptunite is Translucent while Neptunite is Translucent in appearance.

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