Antigorite and Foitite Optical Properties

Antigorite

Foitite

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1 Optical Properties

1.1 Luster

Waxy, Silky, Resinous, Greasy

Vitreous

1.2 Pleochroism

pale greenish yellow.

Strong: pale lavender dark blueAnthony et al

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Translucent

TranslucentAnthony et al, Translucent

1.5 Refractive Index

1.530-1.575Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Monoclinic Domatic H-M Symbol (m) Space Group: Cm

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

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

Translucent

TranslucentAnthony et al

Antigorite and Foitite Optic Character

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

Similar to their colors, Antigorite 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, Antigorite is Translucent while Antigorite is Translucent in appearance.