Tantalite and Sinhalite Optical Properties

Tantalite

Sinhalite

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1 Optical Properties

1.1 Luster

Resinous

Not Available

1.2 Pleochroism

Not Available

Trichroism: green light brown dark brownHerve Nicolas Lazzarelli

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

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

Gemmological Tables (2004) More from other references

1.5 Refractive Index

2.190-2.4571.665-1.712

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

1.8 Birefringence

0.0830.036-0.042

0 0.296

1.9 Clarity

TransparentWalter Schumann

TransparentUlrich Henn and Claudio C. Milisenda

Tantalite and Sinhalite Optic Character

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

Similar to their colors, Tantalite and Sinhalite 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.