Top Five Hardest Metals

Diorite

Its a collection of minerals found in nature, and be an integral part in the composition of Earth's crust. Based on this rock characteristic divided by the last rock and make it a standalone unit. The rock is the basic unit of construction land, while the metal is the same rock unit. Rocks differ from each other in terms of the types of its constituent minerals and the relationship of these metals together in a single rock.

Coal

Coal rock black or brown flammable and combustion. When burning coal, it gives energy in the form of heat. Can be used in the heat released by burning coal to heat homes, fuel for locomotives at the beginning of invention of the steam engine. The primary use today, this energy is in the production of electricity. And give power plants burning coal, two thirds of electricity consumed in the world. And use of coal as well as in the production of coke, a raw material in the manufacture of basic iron and steel. And produces other materials for the production of coke, can be used in the manufacture of medicines, dyes and fertilizers.

Dolomite

Dolomite mineral used as a source of magnesium extracted from the earth's crust. Which is the average hardness and brittle, and is composed of calcium carbonate and magnesium carbonate. The chemical formula of Doulmit CaMg (CO3) 2. And swings dolomite pure color between the white and yellow, has changed impurities, such as iron and manganese, it relegates it to the color crimson or brown, or to any other color. In most cases, similar to dolomite with calcite (calcium carbonate amorphous), made up of calcium carbonate only. And chemical tests used to distinguish between them. On the other hand, the term refers to the type of dolomite rock is composed mainly of dolomite. And may have formed some of the dolomite rocks of hardened sediment, silt, and minerals, at the bottom of the ocean

Flint

Granites formed as a result of a chemical process is the deposition of minerals (Silica) dissolved in saturated aqueous solutions, which may reach the point of over saturation as a result of water loss, thus Vtaatersb decadence that most metals in water and then followed by at least decay, about a grain of sand or fork aquatic

Quartz

Quartz or quartz (German: Quartz) is a metal back his discovery to the French (Pierre Curie) and his brother (Jack), who were studying a sample of Waller ml in 1880, where they noticed a strange phenomenon, which is that when exposing the quartz (silicon dioxide) to an effort to it generates an electric current, and vice versa In the case of quartz crystal exposed to an electric field, they oscillate and vibrate a specific frequency, also found that the vibration and oscillation is characterized by regular and high resolution. This phenomenon, known Balbizokahrbaiip, enabled researchers to manufacture a lot of sensitive equipment, the most important of watches designed to measure time with high accuracy, where the share of quartz watches in the industry more than 85% of the global watch market. The first model is due for an hour made of quartz to 1967 were produced this time by researchers at the Center for e-Noeshetl watches in Switzerland, in 1969, has been the industry's first quartz clock in Japan by the Japanese under the name of Seiko Astron.