Dioptase and Catapleiite Optical Properties

Dioptase

Catapleiite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Weak; dark emerald green

Not Available

1.3 Dispersion

0.04NA

0.007 1

1.4 Transparency

TranslucentHerve Nicolas Lazzarelli

TransparentUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)

1.5 Refractive Index

1.644-1.7201.590-1.629

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Monoclinic Prismatic H-M Symbol (2/m) Space Group: B2/b (pseudo-HEX)

1.8 Birefringence

0.051-0.0530.039

0 0.296

1.9 Clarity

TranslucentHerve Nicolas Lazzarelli

TransparentUlrich Henn and Claudio C. Milisenda

Dioptase and Catapleiite Optic Character

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

Similar to their colors, Dioptase and Catapleiite 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.