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Proustite and Astrophyllite Optical Properties


Astrophyllite and Proustite Optical Properties


Optical Properties

Luster
Adamantine   
Greasy, Pearly   

Pleochroism
Moderate; cochineal-red to blood-red   
Strong: X= deep red-orange Y= orange-yellow Z= lemon-yellow   

Dispersion
Not Available   
Not Available   

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

Refractive Index
2.792-3.087   
1.678-1.758   

Optic Character
Not Available   
Not Available   

Crystal System
Trigonal   
Triclinic   

Birefringence
0.295-0.296   
0.050   

Clarity
OpaqueUlrich Henn and Claudio C. Milisenda   
Translucent   

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Proustite and Astrophyllite Optic Character

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

Similar to their colors, Proustite and Astrophyllite 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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