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Powellite
Powellite

Tortoiseshell
Tortoiseshell



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Powellite
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Tortoiseshell

Powellite and Tortoiseshell Optical Properties

1 Optical Properties
1.1 Luster
Greasy, Subadamantine
Not Available
1.2 Pleochroism
In deeply colored specimens: blue greenAnthony et al
Not Available
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent
Gemmological Tables (2004)
1.5 Refractive Index
1.974-1.9841.540-1.560
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Not Available
Not Available
1.8 Birefringence
Not AvailableNot Available
Achroite
0 0.296
1.9 Clarity
Transparent
OpaqueUlrich Henn and Claudio C. Milisenda

Powellite and Tortoiseshell Optic Character

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

Similar to their colors, Powellite and Tortoiseshell 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.