black iron ore meaning in Hindi

Examples

1. 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.