Dravite and Sunstone Optical Properties

Dravite

Sunstone

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Optical Properties

Luster

Vitreous

Pleochroism

Very strong: pale yellow colorless

Weak or absentWalter Schumann

Dispersion

0.020.01

0.005 1

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Transparency

Transparent

Transparent, Translucent, Transparent to translucent

Refractive Index

1.614-1.6661.53-1.55

1 3.25

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Optic Character

Crystal System

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

Triclinic

Birefringence

0.014-0.0320.007-0.010

0 0.296

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Clarity

Transparent

Transparent to translucent

Dravite and Sunstone Optic Character

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

Similar to their colors, Dravite and Sunstone 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.