Dumortierite and Watermelon Tourmaline Optical Properties

Dumortierite

Watermelon Tourmaline

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

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

Not Available

1.3 Dispersion

None0.02

0.007 1

1.4 Transparency

Translucent, Translucent to opaque

TransparentGemdat.org, Management Team (2012)

1.5 Refractive Index

1.669-1.7231.614-1.666

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Not Available

1.8 Birefringence

0.011-0.0370.014-0.040

0 0.296

1.9 Clarity

Translucent

TransparentGemdat.org

Dumortierite and Watermelon Tourmaline Optic Character

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

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