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Mellite
Mellite

Phenakite
Phenakite



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Mellite
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Phenakite

Mellite and Phenakite Optical Properties

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Optical Properties

Luster

Vitreous
Vitreous

Pleochroism

Weak: yellowish brown yellowAnthony et al
Distinct: colorless orangy-yellowHerve Nicolas Lazzarelli

Dispersion

0.010.02
0.005 1
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Transparency

-
-

Refractive Index

1.509-1.5411.650-1.695
1 3.25
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Optic Character

-
-

Crystal System

-
Trigonal

Birefringence

0.0300.016
0 0.296
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Clarity

TransparentUlrich Henn and Claudio C. Milisenda
TransparentUlrich Henn and Claudio C. Milisenda

Mellite and Phenakite Optic Character

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

Mellite and Phenakite Transparency

Similar to their colors, Mellite and Phenakite 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, Mellite is while Mellite is in appearance.