Anhydrite and Antigorite Optical Properties

Anhydrite

Antigorite

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1 Optical Properties

1.1 Luster

Pearly, Greasy

Waxy, Silky, Resinous, Greasy

1.2 Pleochroism

For violet varieties

pale greenish yellow.

1.3 Dispersion

0.01NA

0.007 1

1.4 Transparency

Transparent

Translucent

1.5 Refractive Index

1.570-1.6141.530-1.575

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

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

1.8 Birefringence

0.042-0.044Not Available

0 0.296

1.9 Clarity

Transparent

Translucent

Anhydrite and Antigorite Optic Character

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

Similar to their colors, Anhydrite and Antigorite 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, Anhydrite is Transparent while Anhydrite is Transparent in appearance.