Anhydrite and Vivianite Optical Properties

Anhydrite

Vivianite

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1 Optical Properties

1.1 Luster

Pearly, Greasy

Vitreous, Pearly

1.2 Pleochroism

For violet varieties

Anomalous plechroism is strong with colours deep blue/pale yellowish green/yellowish green.Michael OâDonoghue

1.3 Dispersion

0.01NA

0.007 1

1.4 Transparency

Transparent

1.5 Refractive Index

1.570-1.6141.560-1.640

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Not Available

1.8 Birefringence

0.042-0.0440.054-0.075

0 0.296

1.9 Clarity

Transparent

Anhydrite and Vivianite Optic Character

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

Similar to their colors, Anhydrite and Vivianite 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.