what colors does onyx come in
For the 1984 video game, see The Black Onyx. Onyx is a banded variety of the silicate mineral chalcedony. Agate and onyx are both varieties of layered chalcedony that differ only in the form of the bands: agate has curved bands and onyx has parallel bands.The colors of its bands range from white to almost every color (save some shades, such as purple or blue).nyx is a banded variety of the silicate mineral chalcedony. Agate and onyx are both varieties of layered chalcedony that differ only in the form of the bands: agate has curved bands and onyx has parallel bands.