Colemanite and Dumortierite Optical Properties

Colemanite

Dumortierite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

NilArthur 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

Transparent

Translucent, Translucent to opaque

1.5 Refractive Index

1.584-1.6151.669-1.723

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Monoclinic Prismatic H-M Symbol (2/m) Space Group: P 21/a

Orthorhombic

1.8 Birefringence

0.028-0.0300.011-0.037

0 0.296

1.9 Clarity

Transparent

Translucent

Colemanite and Dumortierite Optic Character

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

Similar to their colors, Colemanite 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, Colemanite is Transparent while Colemanite is Transparent in appearance.