Andesine and Biotite Optical Properties

Andesine

Biotite

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Optical Properties

Luster

Vitreous

Vitreous, Pearly

Pleochroism

colorless.

Strong

Dispersion

0.70-

0.005 1

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Transparency

Transparent, Translucent, Transparent to translucent

Refractive Index

1.543-1.5641.565-1.625

1 3.25

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Optic Character

Biaxial/+

Crystal System

Triclinic

monoclinic

Birefringence

0.007-0.0110.03-0.07

0 0.296

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Clarity

Transparent

Andesine and Biotite Optic Character

Andesine and Biotite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Andesine 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 Andesine 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. Andesine has Biaxial/+ character.

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Andesine and Biotite Transparency

Similar to their colors, Andesine 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, Andesine is Transparent, Translucent and Transparent to translucent while Andesine is Transparent, Translucent and Transparent to translucent in appearance.