Liddicoatite and Dumortierite Optical Properties

Liddicoatite

Dumortierite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Strong: dark brown light brownAnthony et al

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

Not Available1.669-1.723

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

Orthorhombic

1.8 Birefringence

Not Available0.011-0.037

0 0.296

1.9 Clarity

Transparent

Translucent

Liddicoatite and Dumortierite Optic Character

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

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