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Bertrandite
Bertrandite

Beryl
Beryl



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Bertrandite
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Beryl

Bertrandite and Beryl Optical Properties

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Optical Properties

Luster

Vitreous
Vitreous, Resinous

Pleochroism

none.
Weak to distinct

Dispersion

0.010.01
0.005 1
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Transparency

TransparentAnthony et al
Transparent, Transparent to opaque

Refractive Index

1.583-1.6141.560-1.604
1 3.25
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Optic Character

-
-

Crystal System

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

Birefringence

-99990.0040-0.0070
0 0.296
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Clarity

TransparentAnthony et al
Transparent

Bertrandite and Beryl Optic Character

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

Similar to their colors, Bertrandite and Beryl 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.