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Onyx_.
Onyx
Onyx is a banded variety of chalcedony, a cryptocrystalline form of quartz. The colours of its bands are white and black. It is usually cut as a cabochon, or into beads, and is also used for intaglios and cameos. Some onyx is natural but much is produced by the staining of agate.
Technical Details
Chemical Composition and Name
SiO2 - Silicon dioxide
Hardness (Mohs Scale)
7
Specific Gravity*
2.65 - 2.66
Refractive index (R.I.)
1.543 - 1.552 to 1.545 - 1.554
Birefringence
0.009
Optic Sign
Positive
Optical Character
Uniaxial
- For information about Specific Gravity, see Density
See also: List of minerals.
Onyx is also the name of a Queens, NY rap group.
The above article is adapted from from Wikipedia All Wikipedia article text is available under the terms of the GNU Free Documentation License
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