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Mellite
Mellite

Charlesite
Charlesite



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Mellite
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Charlesite

Mellite and Charlesite Optical Properties

Optical Properties

Luster

Vitreous
Vitreous

Pleochroism

Weak: yellowish brown yellowAnthony et al
Nearly colorless to pale golden yellow

Dispersion

0.010.03
0.005 1
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Transparency

-
-

Refractive Index

1.509-1.5411.492
1 3.25
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Optic Character

-
-

Crystal System

-
Trigonal

Birefringence

0.030-9999
0 0.296
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Clarity

TransparentUlrich Henn and Claudio C. Milisenda
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Mellite and Charlesite Optic Character

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

Similar to their colors, Mellite and Charlesite 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.