Jet and Dumortierite Optical Properties

Jet

Dumortierite

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1 Optical Properties

1.1 Luster

Waxy

Vitreous

1.2 Pleochroism

AbsentWalter Schumann

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

1.3 Dispersion

NoneNone

0.007 1

1.4 Transparency

Gemmological Tables (2004) More from other references

Translucent, Translucent to opaque

1.5 Refractive Index

1.640-1.6801.669-1.723

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Amorphous

Orthorhombic

1.8 Birefringence

Not Available0.011-0.037

0 0.296

1.9 Clarity

Gemmological Tables (2004) More from other references

Translucent

Jet and Dumortierite Optic Character

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

Similar to their colors, Jet 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, Jet is Gemmological Tables (2004) More from other references while Jet is Gemmological Tables (2004) More from other references in appearance.