Sinhalite and Powellite Optical Properties

Sinhalite

Powellite

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1 Optical Properties

1.1 Luster

Not Available

Greasy, Subadamantine

1.2 Pleochroism

Trichroism: green light brown dark brownHerve Nicolas Lazzarelli

In deeply colored specimens: blue greenAnthony et al

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Gemmological Tables (2004) More from other references

Transparent

1.5 Refractive Index

1.665-1.7121.974-1.984

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Not Available

1.8 Birefringence

0.036-0.042Not Available

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Transparent

Sinhalite and Powellite Optic Character

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

Similar to their colors, Sinhalite and Powellite 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.