Onyx
Onyx is a bandit variety o chalcedony. The colours o its bands range frae white tae almaist every colour (save some shades, sic as purpie or blue). Commonly, specimens o onyx contain bands o black an/or white.
Onyx | |
---|---|
A slice o sardonyx (width = 2.5 cm) | |
General | |
Category | Oxide mineral |
Formula (repeatin unit) | Silica (silicon dioxide, SiO2) |
Creestal seestem | Trigonal, Monoclinic |
Identification | |
Formula mass | 60 g / mol |
Colour | Various |
Cleavage | Absent |
Fractur | Uneven, conchoidal |
Mohs scale haurdness | 6–7 |
Skinkle | Vitreous, silky |
Streak | White |
Diaphaneity | Translucent |
Speceefic gravity | 2.65–2.667 |
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