Chalcedony and Zoisite Optical Properties

Chalcedony

Zoisite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

AbsentWalter Schumann

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

1.3 Dispersion

None0.02

0.007 1

1.4 Transparency

Translucent, Translucent to opaque

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

1.5 Refractive Index

1.530-1.5431.685-1.707

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Orthorhombic

1.8 Birefringence

0.003-0.0090.006-0.018

0 0.296

1.9 Clarity

Translucent

Transparent

Chalcedony and Zoisite Optic Character

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

Similar to their colors, Chalcedony 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, Chalcedony is Translucent and Translucent to opaque while Chalcedony is Translucent and Translucent to opaque in appearance.