Tortoiseshell and Brazilianite Optical Properties

Tortoiseshell

Brazilianite

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1 Optical Properties

1.1 Luster

Not Available

Vitreous

1.2 Pleochroism

Not Available

Very weakWalter Schumann

1.3 Dispersion

NA0.01

0.007 1

1.4 Transparency

Gemmological Tables (2004)

Gemmological Tables (2004) More from other references

1.5 Refractive Index

1.540-1.5601.602-1.625

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

monoclinic

1.8 Birefringence

Not Available0.019-0.021

0 0.296

1.9 Clarity

OpaqueUlrich Henn and Claudio C. Milisenda

TransparentUlrich Henn and Claudio C. Milisenda

Tortoiseshell and Brazilianite Optic Character

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

Similar to their colors, Tortoiseshell and Brazilianite 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.