Elbaite and Dravite Optical Properties

Elbaite

Dravite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Pale green

Very strong: pale yellow colorless

1.3 Dispersion

0.020.02

0.007 1

1.4 Transparency

Transparent

1.5 Refractive Index

1.614-1.6661.614-1.666

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

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

1.8 Birefringence

0.014-0.0320.014-0.032

0 0.296

1.9 Clarity

Transparent

Elbaite and Dravite Optic Character

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

Similar to their colors, Elbaite 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, Elbaite is Transparent while Elbaite is Transparent in appearance.