Purpurite and Dumortierite Optical Properties

Purpurite

Dumortierite

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1 Optical Properties

1.1 Luster

Not Available

Vitreous

1.2 Pleochroism

StrongArthur Thomas

Strong; X = deep blue or violet; Y = yellow to red-violet or nearly colorless; Z = colorless or very pale blue

1.3 Dispersion

NANone

0.007 1

1.4 Transparency

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

Translucent, Translucent to opaque

1.5 Refractive Index

1.85-1.921.669-1.723

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

1.8 Birefringence

0.0700.011-0.037

0 0.296

1.9 Clarity

TranslucentWalter Schumann

Translucent

Purpurite and Dumortierite Optic Character

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

Similar to their colors, Purpurite and Dumortierite 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.