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Hessonite
Hessonite

Foitite
Foitite



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Hessonite
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Foitite

Hessonite and Foitite Optical Properties

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Optical Properties

Luster

-
Vitreous

Pleochroism

-
Strong: pale lavender dark blueAnthony et al

Dispersion

0.030.02
0.005 1
👆🏻

Transparency

-
TranslucentAnthony et al, Translucent

Refractive Index

1.742-1.748-9999
1 3.25
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Optic Character

-
-

Crystal System

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

Birefringence

-9999-9999
0 0.296
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Clarity

TransparentUlrich Henn and Claudio C. Milisenda
TranslucentAnthony et al

Hessonite and Foitite Optic Character

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

Hessonite and Foitite Transparency

Similar to their colors, Hessonite and Foitite 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, Hessonite is while Hessonite is in appearance.