Tourmaline and Dumortierite Optical Properties

Tourmaline

Dumortierite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

typically moderate to strong

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

1.3 Dispersion

Albite Optical ..

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0.02

Rank: 22 (Overall)▶

None

Rank: N/A (Overall)▶

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Fluorite Optical Properties

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0.044 (Anglesite Opt..)

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1.4 Transparency

Transparent, Translucent, Transparent to opaque

Translucent, Translucent to opaque

1.5 Refractive Index

1.614-1.666

1.669-1.723

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Orthorhombic

1.8 Birefringence

0.014-0.040

0.011-0.037

1.9 Clarity

Transparent

Translucent

Tourmaline and Dumortierite Optic Character

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

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

Semi Precious

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Amethyst

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