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Mellite
Mellite

Boracite
Boracite



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Mellite
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Boracite

Mellite and Boracite Optical Properties

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Optical Properties

Luster

Vitreous
Vitreous, Adamantine

Pleochroism

Weak: yellowish brown yellowAnthony et al
None

Dispersion

0.01-
0.005 1
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Transparency

-
Transparent

Refractive Index

1.509-1.5411.658-1.673
1 3.25
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Optic Character

-
-

Crystal System

-
Orthorhombic

Birefringence

0.0300.010-0.011
0 0.296
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Clarity

TransparentUlrich Henn and Claudio C. Milisenda
Transparent

Mellite and Boracite Optic Character

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

Similar to their colors, Mellite and Boracite 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.