Tantalite and Dumortierite Optical Properties

Tantalite

Dumortierite

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1 Optical Properties

1.1 Luster

Resinous

Vitreous

1.2 Pleochroism

Not Available

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

TransparentWalter Schumann, Gemstones of the world (2001) More from other references

Translucent, Translucent to opaque

1.5 Refractive Index

2.190-2.4571.669-1.723

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

1.8 Birefringence

0.0830.011-0.037

0 0.296

1.9 Clarity

TransparentWalter Schumann

Translucent

Tantalite and Dumortierite Optic Character

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

Similar to their colors, Tantalite 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, Tantalite is Gemstones of the world (2001) More from other references and TransparentWalter Schumann while Tantalite is Gemstones of the world (2001) More from other references and TransparentWalter Schumann in appearance.