Black Onyx Value, Price, and Jewelry Information

"Onyx" by Simon Eugster --Simon 14:41, 11 April 2006 (UTC) - Own work. Licensed under CC BY-SA 3.0 via Wikimedia Commons.

Onyx

Onyx Information

Data Value
Name Onyx
Is a Variety of Chalcedony
Varieties Sardonyx
Colors Black, white (banded)
Crystallography Hexagonal, microcrystaline.
Refractive Index 1.544-1.553
Luster Waxy.
Polish Luster Vitreous.
Hardness 7
Wearability Excellent
Fracture Conchoidal
Specific Gravity 2.651
Birefringence 0.009
Cleavage None
Dispersion None.
Heat Sensitivity No
Enhancements Dying, common
Typical Treatments Dyeing
Special Care Instructions None
Transparency Opaque.
Formula

SiO2

Pleochroism

None.

Optics

Uniaxial (+).

Optic Sign Uniaxial +

Onyx is banded chalcedony that is found in many different colors including commonly black and white.

Sources

Argentina; Australia; Brazil; Canada; China; Czech Republic; France; Germany; India; Madagascar; Russia; Scotland, United Kingdom; United States.