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Foitite
Foitite

Creedite
Creedite



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Foitite
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Creedite

Foitite and Creedite Optical Properties

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Optical Properties

Luster

Vitreous
Vitreous

Pleochroism

Strong: pale lavender dark blueAnthony et al
-

Dispersion

0.020.02
0.005 1
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Transparency

TranslucentAnthony et al, Translucent
Transparent, Translucent

Refractive Index

-99991.461-1.485
1 3.25
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Optic Character

-
-

Crystal System

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

Birefringence

-99990.024
0 0.296
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Clarity

TranslucentAnthony et al
Transparent

Foitite and Creedite Optic Character

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

Similar to their colors, Foitite and Creedite 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.