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.
World Figure Skating Championships cumulative medal count World Figure Skating Championships cumulative medal count The following is the "cumulative medal count" for countries at the World Figure Skating Championships. It includes countries that no longer exist. Boldface denotes active skaters and highest medal count among all skaters (including these who not included in these tables) per type. Boldface denotes active skaters and highest medal count among all skaters (including these who not included in these tables) per type. Boldface denotes active skaters and highest medal count among all pairs or separate partners (including these who not included in these tables) per type. Italic denotes statistics of performances