Morganite and Alunite Optical Properties

Morganite

Alunite

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Optical Properties

Luster

Vitreous

Vitreous, Pearly

Pleochroism

Distinct: pale pink bluish-pinkHerve Nicolas Lazzarelli

Dispersion

0.010.02

0.005 1

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Transparency

Transparent, Translucent, Transparent to translucent

Refractive Index

1.573-1.6001.572

1 3.25

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Optic Character

Crystal System

Hexagonal

Trigonal

Birefringence

0.005-0.0090.020

0 0.296

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Clarity

Transparent to translucent

Morganite and Alunite Optic Character

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

Similar to their colors, Morganite and Alunite 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, Morganite is Transparent, Translucent and Transparent to translucent while Morganite is Transparent, Translucent and Transparent to translucent in appearance.