Carbon the very large masses of carbonate rock (limestone, dolomite, marble and so on). Coal is very rich in carbon (anthracite contains 92–98%) and is the largest commercial source of mineral carbon, accounting for 4,000 gigatonnes or 80% of fossil fuel. As for individual carbon allotropes, graphite is found in large quantities in the United States (mostly in New York and Texas), Russia, Mexico, Greenland, and India. Natural diamonds occur in the rock kimberlite, found in ancient volcanic "necks", or "pipes". Most diamond deposits are in Africa, notably in South Africa, Namibia, Botswana, the Republic of the Congo, and Sierra Leone.
Coal in Europe in coal mines, caused by the liberation of methane from mining. Annual coal carbon emissions (2005–2008 average) were highest per capita in Europe in Czech Republic 7.4, Kazakhstan 6.9, Poland 5.5, Finland 4.8, Serbia 4.5 and Germany 4.1. Coal in Europe Coal production in Europe is falling, and imports exceed production. There is, however, growing controversy in Europe over the use of coal, as many denounce it for reasons such as health risks and links to global warming. International Energy Agency reports data for EU28 countries since 1990. According to IEA, EU28 countries use of coal as fuel has went