Sinhalite and Cobaltite Optical Properties

Sinhalite

Cobaltite

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1 Optical Properties

1.1 Luster

Not Available

1.2 Pleochroism

Trichroism: green light brown dark brownHerve Nicolas Lazzarelli

Very weak

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Gemmological Tables (2004) More from other references

Gems

1.5 Refractive Index

1.665-1.712Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Orthorhombic Pyramidal H-M Symbol (mm2) Space Group: P ca21

1.8 Birefringence

0.036-0.042Not Available

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Gems

Sinhalite and Cobaltite Optic Character

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

Similar to their colors, Sinhalite and Cobaltite 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, Sinhalite is Gemmological Tables (2004) More from other references while Sinhalite is Gemmological Tables (2004) More from other references in appearance.