Basalt main component is silica, aluminum oxide, iron oxide, calcium oxide and magnesium oxide. Common basalt is black, dark brown or dark green. Because of its dense texture, its specific gravity is heavier than granite, limestone, sandstone, shale. There is also light porous basalt, called "pumice."
Bauxite mine is actually kind of ore minerals collectively formed mainly by gibbsite, a boehmite or a diaspore which can be used in the industry. Bauxite is widely applied in both metal field and nonmetal field. Bauxite ore is the best material for producing aluminum. In nonmetal field, bauxite is mainly used as refractories, abrasives, and the raw materials for high alumina cemen.
Calcium carbonate is limestone and calcite's main ingredient. Calcium carbonate divided into calcium carbonate and PCC. Calcium carbonate is a kind of powder, heavy calcium carbonate powder according to the average particle diameter (d) size can be divided into calcium carbonate particles (d> 5μm), calcium carbonate powder (1μm)
Coal is very important energy source, and also an important raw material for metallurgy and chemical industry, there are lignite, bituminous coal, anthracite coal, semi-anthracite. When the coal seam close to the surface, it ’s called open pit mine and about 40% of world coal production use pen pit mining. Seven largest coal reserves countries are the United States, China, Australia, India, Germany, South Africa and Poland.
Gold occurs principally as a native metal, usually alloyed to a greater or lesser extent with silver, or sometimes with mercury. Native gold occur as sizeable nuggets, as fine grains or flakes in alluvial deposits, or as grains or microscopic particles embedded in other rocks.
Iron ore is an important raw material of steel producers.After crushing, grinding, magnetic separation, flotation, re-election and other procedures,natural minerals(iron ore)elected gradually of iron. Iron exist in nature all in compounds state, especially in the state of iron oxide but has more impurities. Such as hematite, magnetite, siderite, limonite, etc.
The main mineral component of limestone is calcite. It has rare crystal structure and mineral particles and its surface is smooth and granular. Colors are black, gray, white, yellow and brown. Limestone containing seawater formation lime, hence the name of marble, limestone, chalk, rock, etc. Their main component of natural mineral is calcium carbonate.
Pebble is a natural stone from the sand mountains generated by the uplift of the ancient river bed which has experienced the earth movement thousands of years ago. They have gone through the impact of the flash floods and the continuous extrusion, friction in the water movement. They were beat by wave and water again and again. Finally, they were buried deeply in the ground for thousands and millions of years.