Dravite and Scheelite Optical Properties

Dravite

Scheelite

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1 Optical Properties

1.1 Luster

Vitreous

Vitreous, Adamantine

1.2 Pleochroism

Very strong: pale yellow colorless

Definite dichoric in yellow (yellow to orange-brown)

1.3 Dispersion

0.020.04

0.007 1

1.4 Transparency

Transparent

Translucent, Transparent

1.5 Refractive Index

1.614-1.6661.918-1.936

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

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

tetragonal

1.8 Birefringence

0.014-0.0320.016

0 0.296

1.9 Clarity

Transparent

Translucent

Dravite and Scheelite Optic Character

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

Similar to their colors, Dravite and Scheelite 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.