Esperite and Dravite Optical Properties

Esperite

Dravite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

colorless.

Very strong: pale yellow colorless

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

OpaqueAnthony et al, Opaque, Transparent

Transparent

1.5 Refractive Index

1.760-1.7741.614-1.666

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

monoclinic

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

1.8 Birefringence

0.0120.014-0.032

0 0.296

1.9 Clarity

OpaqueAnthony et al

Transparent

Esperite and Dravite Optic Character

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

Similar to their colors, Esperite 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, Esperite is Opaque, OpaqueAnthony et al and Transparent while Esperite is Opaque, OpaqueAnthony et al and Transparent in appearance.