Pearl and Proustite Optical Properties

Pearl

Proustite

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1 Optical Properties

1.1 Luster

Pearly

Adamantine

1.2 Pleochroism

AbsentWalter Schumann

Moderate; cochineal-red to blood-red

1.3 Dispersion

NoneNA

0.007 1

1.4 Transparency

Translucent, Opaque

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

1.5 Refractive Index

1.52-1.662.792-3.087

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Trigonal

1.8 Birefringence

0.1560.295-0.296

0 0.296

1.9 Clarity

Translucent

OpaqueUlrich Henn and Claudio C. Milisenda

Pearl and Proustite Optic Character

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

Similar to their colors, Pearl 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, Pearl is Opaque and Translucent while Pearl is Opaque and Translucent in appearance.