Powellite and Zoisite Optical Properties

Powellite

Zoisite

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1 Optical Properties

1.1 Luster

Greasy, Subadamantine

Vitreous

1.2 Pleochroism

In deeply colored specimens: blue greenAnthony et al

X = pale pink to red-violet; Y = nearly colorless to bright pink or deep blue; Z = pale yellow to yellow-green

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

Transparent

Transparent, Translucent, Opaque . May be translucent in thin backlit sections.

1.5 Refractive Index

1.974-1.9841.685-1.707

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

Orthorhombic

1.8 Birefringence

Not Available0.006-0.018

0 0.296

1.9 Clarity

Transparent

Powellite and Zoisite Optic Character

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

Compare Blue Gemstones

Powellite Vs Rubellite

Powellite Vs Sanidine

Powellite Vs Rock Crystal

Powellite and Zoisite Transparency

Similar to their colors, Powellite and Zoisite 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, Powellite is Transparent while Powellite is Transparent in appearance.