Anhydrite and Cobaltite Optical Properties

Anhydrite

Cobaltite

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1 Optical Properties

1.1 Luster

Pearly, Greasy

Not Available

1.2 Pleochroism

For violet varieties

Very weak

1.3 Dispersion

0.01NA

0.007 1

1.4 Transparency

Transparent

Gems

1.5 Refractive Index

1.570-1.614Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Orthorhombic Pyramidal H-M Symbol (mm2) Space Group: P ca21

1.8 Birefringence

0.042-0.044Not Available

0 0.296

1.9 Clarity

Transparent

Gems

Anhydrite and Cobaltite Optic Character

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

Similar to their colors, Anhydrite and Cobaltite 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.