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Beryl
Beryl

Mottramite
Mottramite



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Beryl
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Mottramite

Beryl and Mottramite Optical Properties

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Optical Properties

Luster

Vitreous, Resinous
Greasy

Pleochroism

Weak to distinct
Visible X=Y= canary yellow to greenish yellow

Dispersion

0.010.04
0.005 1
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Transparency

Transparent, Transparent to opaque
-

Refractive Index

1.560-1.6042.170
1 3.25
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Optic Character

-
-

Crystal System

Hexagonal
Orthorhombic

Birefringence

0.0040-0.00700.150
0 0.296
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Clarity

Transparent
-

Beryl and Mottramite Optic Character

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

Beryl and Mottramite Transparency

Similar to their colors, Beryl and Mottramite 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, Beryl is Transparent and Transparent to opaque while Beryl is Transparent and Transparent to opaque in appearance.