Foitite and Zoisite Optical Properties

Foitite

Zoisite

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Optical Properties

Luster

Vitreous

Pleochroism

Strong: pale lavender dark blueAnthony et al

X = pale pink to red-violet; Y = nearly colorless to bright pink or deep blue; Z = pale yellow to yellow-green

Dispersion

0.020.02

0.005 1

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Transparency

TranslucentAnthony et al, Translucent

Transparent, Translucent, Opaque . May be translucent in thin backlit sections.

Refractive Index

-99991.685-1.707

1 3.25

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Optic Character

Crystal System

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

Orthorhombic

Birefringence

-99990.006-0.018

0 0.296

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Clarity

TranslucentAnthony et al

Transparent

Foitite and Zoisite Optic Character

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

Similar to their colors, Foitite and Zoisite 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.