Dravite and Anhydrite Optical Properties

Dravite

Anhydrite

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1 Optical Properties

1.1 Luster

Vitreous

Pearly, Greasy

1.2 Pleochroism

Very strong: pale yellow colorless

For violet varieties

1.3 Dispersion

0.020.01

0.007 1

1.4 Transparency

Transparent

1.5 Refractive Index

1.614-1.6661.570-1.614

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

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

Orthorhombic

1.8 Birefringence

0.014-0.0320.042-0.044

0 0.296

1.9 Clarity

Transparent

Dravite and Anhydrite Optic Character

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

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