Vesuvianite and Dravite Optical Properties

Vesuvianite

Dravite

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1 Optical Properties

1.1 Luster

Vitreous, Resinous

Vitreous

1.2 Pleochroism

slight in colored varieties

Very strong: pale yellow colorless

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

Not Available

Transparent

1.5 Refractive Index

1.703-1.7521.614-1.666

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

tetragonal

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

1.8 Birefringence

0.004-0.0060.014-0.032

0 0.296

1.9 Clarity

Not Available

Transparent

Vesuvianite and Dravite Optic Character

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

Similar to their colors, Vesuvianite 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, Vesuvianite is Not Available while Vesuvianite is Not Available in appearance.