Mellite and Onyx Optical Properties

Mellite

Onyx

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Weak: yellowish brown yellowAnthony et al

Not Available

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Gemmological Tables (2004) More from other references

Translucent, Opaque, Translucent to opaque

1.5 Refractive Index

1.509-1.5411.530-1.543

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

Trigonal

1.8 Birefringence

0.030Not Available

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

OpaqueHerve Nicolas Lazzarelli

Mellite and Onyx Optic Character

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

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Mellite and Onyx Transparency

Similar to their colors, Mellite and Onyx 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 Gemmological Tables (2004) More from other references while Mellite is Gemmological Tables (2004) More from other references in appearance.