Tortoiseshell and Tantalite Optical Properties

Tortoiseshell

Tantalite

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1 Optical Properties

1.1 Luster

Not Available

Resinous

1.2 Pleochroism

Not Available

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Gemmological Tables (2004)

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

1.5 Refractive Index

1.540-1.5602.190-2.457

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

Orthorhombic

1.8 Birefringence

Not Available0.083

0 0.296

1.9 Clarity

OpaqueUlrich Henn and Claudio C. Milisenda

TransparentWalter Schumann

Tortoiseshell and Tantalite Optic Character

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

Similar to their colors, Tortoiseshell and Tantalite 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, Tortoiseshell is Gemmological Tables (2004) while Tortoiseshell is Gemmological Tables (2004) in appearance.