Tortoiseshell and Nickeline Optical Properties

Tortoiseshell

Nickeline

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1 Optical Properties

1.1 Luster

Not Available

1.2 Pleochroism

Not Available

Strong (reflected light)

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Gemmological Tables (2004)

Not Available

1.5 Refractive Index

1.540-1.560Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

Hexagonal

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

OpaqueUlrich Henn and Claudio C. Milisenda

Not Available

Tortoiseshell and Nickeline Optic Character

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

Similar to their colors, Tortoiseshell and Nickeline 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.