Almandine and Onyx Optical Properties

Almandine

Onyx

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1 Optical Properties

1.1 Luster

Greasy, Vitreous

Vitreous

1.2 Pleochroism

None

Not Available

1.3 Dispersion

0.03NA

0.007 1

1.4 Transparency

Gemmological Tables (2004) More from other references

Translucent, Opaque, Translucent to opaque

1.5 Refractive Index

1.770-1.8201.530-1.543

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

cubic

Trigonal

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

OpaqueHerve Nicolas Lazzarelli

Almandine and Onyx Optic Character

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

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