Dravite and Williamsite Optical Properties

Dravite

Williamsite

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Optical Properties

Luster

Vitreous

Waxy, Silky, Resinous, Greasy

Pleochroism

Very strong: pale yellow colorless

Dispersion

0.020.03

0.005 1

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Transparency

Transparent

TranslucentHerve Nicolas Lazzarelli

Refractive Index

1.614-1.6661.530-1.575

1 3.25

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Optic Character

Crystal System

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

Birefringence

0.014-0.032-9999

0 0.296

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Clarity

Transparent

TranslucentHerve Nicolas Lazzarelli

Dravite and Williamsite Optic Character

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

Similar to their colors, Dravite and Williamsite 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.