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Foitite
Foitite

Gedrite
Gedrite



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Foitite
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Gedrite

Foitite and Gedrite Optical Properties

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Optical Properties

Luster

Vitreous
Vitreous

Pleochroism

Strong: pale lavender dark blueAnthony et al
Weak to moderate

Dispersion

0.020.02
0.005 1
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Transparency

TranslucentAnthony et al, Translucent
Transparent

Refractive Index

-99991.625-1.718
1 3.25
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Optic Character

-
-

Crystal System

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

TranslucentAnthony et al
Transparent

Foitite and Gedrite Optic Character

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

Foitite and Gedrite Transparency

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