Tortoiseshell and Purpurite Optical Properties

Tortoiseshell

Purpurite

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1 Optical Properties

1.1 Luster

Not Available

1.2 Pleochroism

Not Available

StrongArthur Thomas

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Gemmological Tables (2004)

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

1.5 Refractive Index

1.540-1.5601.85-1.92

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

Orthorhombic

1.8 Birefringence

Not Available0.070

0 0.296

1.9 Clarity

OpaqueUlrich Henn and Claudio C. Milisenda

TranslucentWalter Schumann

Tortoiseshell and Purpurite Optic Character

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

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Tortoiseshell and Purpurite Transparency

Similar to their colors, Tortoiseshell 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, Tortoiseshell is Gemmological Tables (2004) while Tortoiseshell is Gemmological Tables (2004) in appearance.