Dravite and Manganotantalite Optical Properties

Dravite

Manganotantalite

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1 Optical Properties

1.1 Luster

Vitreous

Not Available

1.2 Pleochroism

Very strong: pale yellow colorless

Sometimes strongArthur Thomas

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent

TransparentWalter Schumann, Gemstones of the world (2001) More from other references

1.5 Refractive Index

1.614-1.6662.19-2.34

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

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

Not Available

1.8 Birefringence

0.014-0.0320.015

0 0.296

1.9 Clarity

Transparent

TransparentWalter Schumann

Dravite and Manganotantalite Optic Character

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

Similar to their colors, Dravite and Manganotantalite 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.