Sodalite and Biotite Optical Properties

Sodalite

Biotite

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1 Optical Properties

1.1 Luster

Greasy

Vitreous, Pearly

1.2 Pleochroism

AbsentWalter Schumann

Strong

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent, Translucent, Opaque

Not Available

1.5 Refractive Index

1.478-1.4881.565-1.625

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

cubic

monoclinic

1.8 Birefringence

Not Available0.03-0.07

0 0.296

1.9 Clarity

Transparent

Not Available

Sodalite and Biotite Optic Character

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

Similar to their colors, Sodalite 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, Sodalite is Opaque, Translucent and Transparent while Sodalite is Opaque, Translucent and Transparent in appearance.