Andesine and Colemanite Optical Properties

Andesine

Colemanite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

colorless.

NilArthur Thomas

1.3 Dispersion

0.70NA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

Transparent

1.5 Refractive Index

1.543-1.5641.584-1.615

1 3.25

1.6 Optic Character

Biaxial/+

Not Available

1.7 Crystal System

Triclinic

Monoclinic Prismatic H-M Symbol (2/m) Space Group: P 21/a

1.8 Birefringence

0.007-0.0110.028-0.030

0 0.296

1.9 Clarity

Transparent

Andesine and Colemanite Optic Character

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

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