Anhydrite and Franklinite Optical Properties

Anhydrite

Franklinite

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1 Optical Properties

1.1 Luster

Pearly, Greasy

Not Available

1.2 Pleochroism

For violet varieties

Not Available

1.3 Dispersion

0.01NA

0.007 1

1.4 Transparency

Transparent

Translucent

1.5 Refractive Index

1.570-1.614Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Isometric Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3m

1.8 Birefringence

0.042-0.044Not Available

0 0.296

1.9 Clarity

Transparent

Translucent

Anhydrite and Franklinite Optic Character

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

Similar to their colors, Anhydrite and Franklinite 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.