Sunstone and Purpurite Optical Properties

Sunstone

Purpurite

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1 Optical Properties

1.1 Luster

Vitreous

Not Available

1.2 Pleochroism

Weak or absentWalter Schumann

StrongArthur Thomas

1.3 Dispersion

NoneNA

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

1.53-1.551.85-1.92

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Triclinic

Orthorhombic

1.8 Birefringence

0.007-0.0100.070

0 0.296

1.9 Clarity

Transparent to translucent

TranslucentWalter Schumann

Sunstone and Purpurite Optic Character

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

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