Tantalite and Riebeckite Optical Properties

Tantalite

Riebeckite

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1 Optical Properties

1.1 Luster

Resinous

Vitreous, Silky

1.2 Pleochroism

Not Available

X = blue

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

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

Not Available

1.5 Refractive Index

2.190-2.4571.680-1.698

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

monoclinic

1.8 Birefringence

0.0830.005-0.008

0 0.296

1.9 Clarity

TransparentWalter Schumann

Not Available

Tantalite and Riebeckite Optic Character

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

Similar to their colors, Tantalite and Riebeckite 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.