Onyx and Siderite Optical Properties

Onyx

Siderite

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1 Optical Properties

1.1 Luster

Vitreous

Pearly

1.2 Pleochroism

Not Available

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Translucent, Opaque, Translucent to opaque

Transparent, Translucent

1.5 Refractive Index

1.530-1.5431.633-1.875

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

1.8 Birefringence

Not Available0.242

0 0.296

1.9 Clarity

OpaqueHerve Nicolas Lazzarelli

Transparent

Onyx and Siderite Optic Character

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

Similar to their colors, Onyx and Siderite 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, Onyx is Opaque, Translucent and Translucent to opaque while Onyx is Opaque, Translucent and Translucent to opaque in appearance.