Beryllonite and Zoisite Optical Properties

Beryllonite

Zoisite

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Optical Properties

Luster

Vitreous, Adamantine, Pearly

Vitreous

Pleochroism

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

Dispersion

0.010.02

0.005 1

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Transparency

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

Refractive Index

1.552-1.5621.685-1.707

1 3.25

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Optic Character

Crystal System

monoclinic

Orthorhombic

Birefringence

0.0090.006-0.018

0 0.296

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Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Transparent

Beryllonite and Zoisite Optic Character

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

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Beryllonite and Zoisite Transparency

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