Purpurite and Onyx Optical Properties

Purpurite

Onyx

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1 Optical Properties

1.1 Luster

Not Available

Vitreous

1.2 Pleochroism

StrongArthur Thomas

Not Available

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

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

Translucent, Opaque, Translucent to opaque

1.5 Refractive Index

1.85-1.921.530-1.543

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Trigonal

1.8 Birefringence

0.070Not Available

0 0.296

1.9 Clarity

TranslucentWalter Schumann

OpaqueHerve Nicolas Lazzarelli

Purpurite and Onyx Optic Character

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

Similar to their colors, Purpurite and Onyx 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, Purpurite is Gemstones of the world (2001) More from other references and TranslucentWalter Schumann while Purpurite is Gemstones of the world (2001) More from other references and TranslucentWalter Schumann in appearance.