Peridot and Proustite Optical Properties

Peridot

Proustite

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1 Optical Properties

1.1 Luster

Vitreous, Greasy

Adamantine

1.2 Pleochroism

Weak: yellow-green green (colorless)Herve Nicolas Lazzarelli

Moderate; cochineal-red to blood-red

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent

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

1.5 Refractive Index

1.64-1.692.792-3.087

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Trigonal

1.8 Birefringence

0.0360.295-0.296

0 0.296

1.9 Clarity

Transparent

OpaqueUlrich Henn and Claudio C. Milisenda

Peridot and Proustite Optic Character

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

Similar to their colors, Peridot 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, Peridot is Transparent while Peridot is Transparent in appearance.