Dioptase and Proustite Optical Properties

Dioptase

Proustite

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1 Optical Properties

1.1 Luster

Vitreous

Adamantine

1.2 Pleochroism

Weak; dark emerald green

Moderate; cochineal-red to blood-red

1.3 Dispersion

0.04NA

0.007 1

1.4 Transparency

TranslucentHerve Nicolas Lazzarelli

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

1.5 Refractive Index

1.644-1.7202.792-3.087

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

1.8 Birefringence

0.051-0.0530.295-0.296

0 0.296

1.9 Clarity

TranslucentHerve Nicolas Lazzarelli

OpaqueUlrich Henn and Claudio C. Milisenda

Dioptase and Proustite Optic Character

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

Similar to their colors, Dioptase 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, Dioptase is TranslucentHerve Nicolas Lazzarelli while Dioptase is TranslucentHerve Nicolas Lazzarelli in appearance.