Allanite and Zoisite Optical Properties

Allanite

Zoisite

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1 Optical Properties

1.1 Luster

Not Available

Vitreous

1.2 Pleochroism

Not Available

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

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

Not Available

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

1.5 Refractive Index

11.685-1.707

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

Orthorhombic

1.8 Birefringence

0.013-0.0360.006-0.018

0 0.296

1.9 Clarity

Not Available

Transparent

Allanite and Zoisite Optic Character

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

Similar to their colors, Allanite 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, Allanite is Not Available while Allanite is Not Available in appearance.