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Powellite
Powellite

Gedrite
Gedrite



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Powellite
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Gedrite

Powellite and Gedrite Optical Properties

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Optical Properties

Luster

Greasy, Subadamantine
Vitreous

Pleochroism

In deeply colored specimens: blue greenAnthony et al
Weak to moderate

Dispersion

0.030.02
0.005 1
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Transparency

Transparent
Transparent

Refractive Index

1.974-1.9841.625-1.718
1 3.25
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Optic Character

-
-

Crystal System

-
Orthorhombic Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma

Birefringence

-9999-9999
0 0.296
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Clarity

Transparent
Transparent

Powellite and Gedrite Optic Character

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

Powellite and Gedrite Transparency

Similar to their colors, Powellite and Gedrite 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, Powellite is Transparent while Powellite is Transparent in appearance.