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Mellite
Mellite

Hematite
Hematite



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Mellite
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Hematite

Mellite and Hematite Optical Properties

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Optical Properties

Luster

Vitreous
-

Pleochroism

Weak: yellowish brown yellowAnthony et al
O = brownish red; E = yellowish red

Dispersion

0.010.05
0.005 1
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Transparency

-
OpaqueHerve Nicolas Lazzarelli

Refractive Index

1.509-1.5412.690-3.220
1 3.25
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Optic Character

-
-

Crystal System

-
Trigonal

Birefringence

0.0300.280
0 0.296
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Clarity

TransparentUlrich Henn and Claudio C. Milisenda
OpaqueHerve Nicolas Lazzarelli

Mellite and Hematite Optic Character

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

Similar to their colors, Mellite and Hematite 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.