manganese psilomelane rock stone on white background. from amphoe mae taeng, chiang mai, thailand.

aggregate background basalt big black boulder carbon cerussite close coal collection conglomerate crystal deep example formations fossil fuel generally geological geology gneiss granite grey hand igneous isolated macro made mass matter metamorphic mineral mineraloid minerals mixed natural naturally nature object occurring ore pebble percent processes psilomelane raw rock rocks rough sample solid specimen stone texture white