Anorthite and Foitite Optical Properties

Anorthite

Foitite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

colorless.

Strong: pale lavender dark blueAnthony et al

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent

TranslucentAnthony et al, Translucent

1.5 Refractive Index

1.575-1.588Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Triclinic

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

1.8 Birefringence

0.012-0.013Not Available

0 0.296

1.9 Clarity

Transparent

TranslucentAnthony et al

Anorthite and Foitite Optic Character

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

Similar to their colors, Anorthite 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, Anorthite is Transparent while Anorthite is Transparent in appearance.