Povondraite and Dravite Optical Properties

Povondraite

Dravite

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1 Optical Properties

1.1 Luster

Resinous

Vitreous

1.2 Pleochroism

Strong: yellow-brown

Very strong: pale yellow colorless

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

Translucent

Transparent

1.5 Refractive Index

Not Available1.614-1.666

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

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

1.8 Birefringence

Not Available0.014-0.032

0 0.296

1.9 Clarity

Translucent

Transparent

Povondraite and Dravite Optic Character

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

Similar to their colors, Povondraite 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, Povondraite is Translucent while Povondraite is Translucent in appearance.