Esperite and Biotite Optical Properties

Esperite

Biotite

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Optical Properties

Luster

Vitreous

Vitreous, Pearly

Pleochroism

colorless.

Strong

Dispersion

0.02-

0.005 1

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Transparency

OpaqueAnthony et al, Opaque, Transparent

Refractive Index

1.760-1.7741.565-1.625

1 3.25

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Optic Character

Crystal System

monoclinic

Birefringence

0.0120.03-0.07

0 0.296

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Clarity

OpaqueAnthony et al

Esperite and Biotite Optic Character

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

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