Dravite and Omphacite Optical Properties

Dravite

Omphacite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Very strong: pale yellow colorless

Weak: colorless -- very pale green -- very pale green

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent

TranslucentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.614-1.6661.662-1.723

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

0.014-0.032Not Available

0 0.296

1.9 Clarity

Transparent

TranslucentAnthony et al

Dravite and Omphacite Optic Character

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

Similar to their colors, Dravite and Omphacite 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.