Chrysoberyl and Powellite Optical Properties

Chrysoberyl

Powellite

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1 Optical Properties

1.1 Luster

Vitreous

Greasy, Subadamantine

1.2 Pleochroism

X = red; Y = yellow-orange; Z = emerald-green

In deeply colored specimens: blue greenAnthony et al

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

Transparent

1.5 Refractive Index

1.746-1.7631.974-1.984

1 3.25

1.6 Optic Character

Biaxial/+

Not Available

1.7 Crystal System

Orthorhombic

Not Available

1.8 Birefringence

0.007-0.013Not Available

0 0.296

1.9 Clarity

Transparent

Chrysoberyl and Powellite Optic Character

Chrysoberyl and Powellite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Chrysoberyl 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 Chrysoberyl 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. Chrysoberyl has Biaxial/+ character.

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Chrysoberyl and Powellite Transparency

Similar to their colors, Chrysoberyl 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, Chrysoberyl is Translucent, Transparent and Transparent to translucent while Chrysoberyl is Translucent, Transparent and Transparent to translucent in appearance.