Rubellite and Dumortierite Optical Properties

Rubellite

Dumortierite

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1 Optical Properties

1.1 Luster

Not Available

Vitreous

1.2 Pleochroism

Strong: dark red pinkish-redHerve Nicolas Lazzarelli

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

1.3 Dispersion

0.02None

0.007 1

1.4 Transparency

Transparent, Translucent

Translucent, Translucent to opaque

1.5 Refractive Index

1.614-1.6661.669-1.723

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

Orthorhombic

1.8 Birefringence

0.014-0.0400.011-0.037

0 0.296

1.9 Clarity

Transparent

Translucent

Rubellite and Dumortierite Optic Character

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

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