Variscite and Dravite Optical Properties

Variscite

Dravite

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1 Optical Properties

1.1 Luster

Vitreous, Waxy

Vitreous

1.2 Pleochroism

MissingWalter Schumann

Very strong: pale yellow colorless

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

Translucent, Opaque . May be translucent when backlit on the edges.

Transparent

1.5 Refractive Index

1.560-1.5941.614-1.666

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

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

1.8 Birefringence

0.0310.014-0.032

0 0.296

1.9 Clarity

Translucent

Transparent

Variscite and Dravite Optic Character

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

Similar to their colors, Variscite and Dravite 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, Variscite is Opaque . May be translucent when backlit on the edges. and Translucent while Variscite is Opaque . May be translucent when backlit on the edges. and Translucent in appearance.