Zoisite and Anhydrite Optical Properties

Zoisite

Anhydrite

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1 Optical Properties

1.1 Luster

Vitreous

Pearly, Greasy

1.2 Pleochroism

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

For violet varieties

1.3 Dispersion

Albite Optical ..

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0.02

Rank: 19 (Overall)▶

0.01

Rank: 27 (Overall)▶

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Fluorite Optical Properties

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0.044 (Anglesite Opt..)

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1.4 Transparency

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

Transparent

1.5 Refractive Index

1.685-1.707

1.570-1.614

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

1.8 Birefringence

0.006-0.018

0.042-0.044

1.9 Clarity

Transparent

Zoisite and Anhydrite Optic Character

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

Similar to their colors, Zoisite and Anhydrite 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, Zoisite is Opaque . May be translucent in thin backlit sections., Translucent and Transparent while Zoisite is Opaque . May be translucent in thin backlit sections., Translucent and Transparent in appearance.