Garnet and Foitite Optical Properties

Garnet

Foitite

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1 Optical Properties

1.1 Luster

Vitreous, Adamantine, Vitreous, Adamantine

Vitreous

1.2 Pleochroism

None

Strong: pale lavender dark blueAnthony et al

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent, Transparent to translucent

TranslucentAnthony et al, Translucent

1.5 Refractive Index

1.730-1.895Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

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

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

Transparent

TranslucentAnthony et al

Garnet and Foitite Optic Character

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

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Garnet and Foitite Transparency

Similar to their colors, Garnet 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, Garnet is Transparent and Transparent to translucent while Garnet is Transparent and Transparent to translucent in appearance.