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Proustite and Holmquistite Optical Properties


Holmquistite and Proustite Optical Properties


Optical Properties

Luster
Adamantine   
Vitreous   

Pleochroism
Moderate; cochineal-red to blood-red   
Strong in shades of violet when dark-colored.Anthony et al   

Dispersion
Not Available   
Not Available   

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

Refractive Index
2.792-3.087   
1.622-1.666   

Optic Character
Not Available   
Not Available   

Crystal System
Trigonal   
Orthorhombic Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma   

Birefringence
0.295-0.296   
Not Available   

Clarity
OpaqueUlrich Henn and Claudio C. Milisenda   
Transparent   

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Proustite and Holmquistite Optic Character

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

Similar to their colors, Proustite and Holmquistite 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, Proustite is Gemmological Tables (2004) Rarely transparentMore from other references and OpaqueUlrich Henn and Claudio C. Milisenda while Proustite is Gemmological Tables (2004) Rarely transparentMore from other references and OpaqueUlrich Henn and Claudio C. Milisenda in appearance.

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