no because it contains impurities
no, it is an element. therefore, can neither be homogeneous nor heterogeneous
Iron with rust is a heterogeneous mixture as the two remain separate from one another in distinct phases.
Iron Ore. Iron ore is a heterogeneous substance.
Very seldom will you find some specimen gold , a nugget in a quartz vein. Usually, the gold will be mixed along with many other minerals, copper, silver, platinum, tungsten ... .So it is not often...