Friedrich Mohs harder. This became the basis of the hardness scale developed by Mohs. The hardest mineral, diamond was given a value of 10 and softer minerals such as talc were given the very low value of 1 (unity). Other minerals were given intermediate values, depending on their ability to scratch another mineral in the scale. Thus gypsum was given the value 2 because it will scratch talc crystals, and calcite the value 3 because it will scratch gypsum. Minerals are also now classified by chemical characteristics, but the physical properties are still useful in field examination. In 1812, Mohs became a
Mineral industry of Azerbaijan produced steel products from steel scrap. In 2005, production increased for practically all mineral commodities. Crude petroleum production increased by more than 43% compared with that of 2004. The country was developing its steel industry, although it is still on a small scale. Fuels accounted for 76% of the value of exports in 2005. The country’s major export was crude petroleum, almost all of which was sold on world markets rather than supplied to other CIS countries. Other mineral exports included petroleum refinery products and alumina. The country imported a variety of mineral commodities, including natural gas. Azerbaijan’s major mineral