Amethyst and Zoisite Optical Properties

Amethyst

Zoisite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

None

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

1.3 Dispersion

0.010.02

0.007 1

1.4 Transparency

Transparent, Transparent to translucent

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

1.5 Refractive Index

1.544-1.5531.685-1.707

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Orthorhombic

1.8 Birefringence

0.0090.006-0.018

0 0.296

1.9 Clarity

Transparent

Amethyst and Zoisite Optic Character

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

Similar to their colors, Amethyst 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, Amethyst is Transparent and Transparent to translucent while Amethyst is Transparent and Transparent to translucent in appearance.