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Foitite
Foitite

Phenakite
Phenakite



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Foitite
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Phenakite

Foitite and Phenakite Optical Properties

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Optical Properties

Luster

Vitreous
Vitreous

Pleochroism

Strong: pale lavender dark blueAnthony et al
Distinct: colorless orangy-yellowHerve Nicolas Lazzarelli

Dispersion

0.020.02
0.005 1
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Transparency

TranslucentAnthony et al, Translucent
-

Refractive Index

-99991.650-1.695
1 3.25
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Optic Character

-
-

Crystal System

Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
Trigonal

Birefringence

-99990.016
0 0.296
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Clarity

TranslucentAnthony et al
TransparentUlrich Henn and Claudio C. Milisenda

Foitite and Phenakite Optic Character

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

Foitite and Phenakite Transparency

Similar to their colors, Foitite and Phenakite 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, Foitite is TranslucentAnthony et al and Translucent while Foitite is TranslucentAnthony et al and Translucent in appearance.