Andesine and Purpurite Optical Properties

Andesine

Purpurite

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1 Optical Properties

1.1 Luster

Vitreous

Not Available

1.2 Pleochroism

colorless.

StrongArthur Thomas

1.3 Dispersion

0.70NA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

TranslucentWalter Schumann, Gemstones of the world (2001) More from other references

1.5 Refractive Index

1.543-1.5641.85-1.92

1 3.25

1.6 Optic Character

Biaxial/+

Not Available

1.7 Crystal System

Triclinic

Orthorhombic

1.8 Birefringence

0.007-0.0110.070

0 0.296

1.9 Clarity

Transparent

TranslucentWalter Schumann

Andesine and Purpurite Optic Character

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

Similar to their colors, Andesine and Purpurite 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.