Hematite and Tortoiseshell Optical Properties

Hematite

Tortoiseshell

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1 Optical Properties

1.1 Luster

Not Available

1.2 Pleochroism

O = brownish red; E = yellowish red

Not Available

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

OpaqueHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references

Gemmological Tables (2004)

1.5 Refractive Index

2.690-3.2201.540-1.560

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Not Available

1.8 Birefringence

0.280Not Available

0 0.296

1.9 Clarity

OpaqueHerve Nicolas Lazzarelli

OpaqueUlrich Henn and Claudio C. Milisenda

Hematite and Tortoiseshell Optic Character

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

Similar to their colors, Hematite and Tortoiseshell 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, Hematite is Blue Chart Gem Identification (2010) More from other references and OpaqueHerve Nicolas Lazzarelli while Hematite is Blue Chart Gem Identification (2010) More from other references and OpaqueHerve Nicolas Lazzarelli in appearance.