The clay body can contain black iron ores, flint, quartz, red iron ores, shale fragments, and white mica.
2.
It is a hard, sandy fabric, varying in colour from dark-grey or black with a brown or reddish brown core and a reddish-brown, blue-grey, black or lighter ('pearly grey') surface . The clay body can contain black iron ore, mica, and quartz, all in a matrix of sediment.
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