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Phenakite
Phenakite

Zoisite
Zoisite



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Phenakite
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Zoisite

Phenakite and Zoisite Optical Properties

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Optical Properties

Luster

Vitreous
Vitreous

Pleochroism

Distinct: colorless orangy-yellowHerve Nicolas Lazzarelli
X = pale pink to red-violet; Y = nearly colorless to bright pink or deep blue; Z = pale yellow to yellow-green

Dispersion

0.020.02
0.005 1
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Transparency

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

Refractive Index

1.650-1.6951.685-1.707
1 3.25
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Optic Character

-
-

Crystal System

Trigonal
Orthorhombic

Birefringence

0.0160.006-0.018
0 0.296
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Clarity

TransparentUlrich Henn and Claudio C. Milisenda
Transparent

Phenakite and Zoisite Optic Character

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

Phenakite and Zoisite Transparency

Similar to their colors, Phenakite 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, Phenakite is while Phenakite is in appearance.