Proustite and Powellite Optical Properties

Proustite

Powellite

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1 Optical Properties

1.1 Luster

Adamantine

Greasy, Subadamantine

1.2 Pleochroism

Moderate; cochineal-red to blood-red

In deeply colored specimens: blue greenAnthony et al

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

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

Transparent

1.5 Refractive Index

2.792-3.0871.974-1.984

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Not Available

1.8 Birefringence

0.295-0.296Not Available

0 0.296

1.9 Clarity

OpaqueUlrich Henn and Claudio C. Milisenda

Transparent

Proustite and Powellite Optic Character

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

Similar to their colors, Proustite and Powellite 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.