Prasiolite and Foitite Optical Properties

Prasiolite

Foitite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Very weak: light green pale greenWalter Schumann

Strong: pale lavender dark blueAnthony et al

1.3 Dispersion

0.01NA

0.007 1

1.4 Transparency

Transparent, Translucent

TranslucentAnthony et al, Translucent

1.5 Refractive Index

1.544-1.553Not 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

0.009Not Available

0 0.296

1.9 Clarity

Transparent

TranslucentAnthony et al

Prasiolite and Foitite Optic Character

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

Similar to their colors, Prasiolite 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, Prasiolite is Translucent and Transparent while Prasiolite is Translucent and Transparent in appearance.