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Idocrase
Idocrase

Mellite
Mellite



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Idocrase
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Mellite

Idocrase and Mellite Optical Properties

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Optical Properties

Luster

-
Vitreous

Pleochroism

-
Weak: yellowish brown yellowAnthony et al

Dispersion

0.020.01
0.005 1
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Transparency

-
-

Refractive Index

1.67-1.761.509-1.541
1 3.25
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Optic Character

-
-

Crystal System

tetragonal
-

Birefringence

-99990.030
0 0.296
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Clarity

-
TransparentUlrich Henn and Claudio C. Milisenda

Idocrase and Mellite Optic Character

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

Idocrase and Mellite Transparency

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