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Bertrandite
Bertrandite

Dioptase
Dioptase



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Bertrandite
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Dioptase

Bertrandite and Dioptase Optical Properties

Optical Properties

Luster

Vitreous
Vitreous

Pleochroism

none.
Weak; dark emerald green

Dispersion

0.010.04
0.005 1
👆🏻

Transparency

TransparentAnthony et al
TranslucentHerve Nicolas Lazzarelli

Refractive Index

1.583-1.6141.644-1.720
1 3.25
👆🏻

Optic Character

-
-

Crystal System

Orthorhombic Pyramidal H-M Symbol (mm2) Space Group: Ccm21
Trigonal

Birefringence

-99990.051-0.053
0 0.296
👆🏻

Clarity

TransparentAnthony et al
TranslucentHerve Nicolas Lazzarelli

Bertrandite and Dioptase Optic Character

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

Bertrandite and Dioptase Transparency

Similar to their colors, Bertrandite and Dioptase 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, Bertrandite is TransparentAnthony et al while Bertrandite is TransparentAnthony et al in appearance.