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Mellite
Mellite

Idocrase
Idocrase



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Mellite
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Idocrase

Mellite and Idocrase Optical Properties

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Optical Properties

Luster

Vitreous
-

Pleochroism

Weak: yellowish brown yellowAnthony et al
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Dispersion

0.010.02
0.005 1
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Transparency

-
-

Refractive Index

1.509-1.5411.67-1.76
1 3.25
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Optic Character

-
-

Crystal System

-
tetragonal

Birefringence

0.030-9999
0 0.296
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Clarity

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

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

Similar to their colors, Mellite and Idocrase 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.