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Foitite
Foitite

Mottramite
Mottramite



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Foitite
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Mottramite

Foitite and Mottramite Optical Properties

Optical Properties

Luster

Vitreous
Greasy

Pleochroism

Strong: pale lavender dark blueAnthony et al
Visible X=Y= canary yellow to greenish yellow

Dispersion

0.020.04
0.005 1
👆🏻

Transparency

TranslucentAnthony et al, Translucent
-

Refractive Index

-99992.170
1 3.25
👆🏻

Optic Character

-
-

Crystal System

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

Birefringence

-99990.150
0 0.296
👆🏻

Clarity

TranslucentAnthony et al
-

Foitite and Mottramite Optic Character

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

Similar to their colors, Foitite and Mottramite 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.