Onyx is composed of very fine intergrowths of minerals, quartz, and moganite.  Onyx has a waxy luster, and may be semi-transparent or translucent.  It can assume a wide range of colors; most commonly seen are white to gray, gray-blue, or shades of brown that could be pale or nearly black in color.

Blue Grey Cebrino Vein Cut Cebrino GreenHoneyIvoryMoonlight BlendMoonlight Turtle Brown White