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What is Anthracite?Anthracite is a type of coal, and is the coal with the highest carbon content, in excess of 95% by weight. Like most minerals, anthracite is formed over millions of years of deposited plant layers, combined with pressure and temperature.Of all the carbon materials, this black and rather shiny mineral is the hardest of them all. Long used in water filtration applications, the anthracite used for water filtration is usually specially selected from deeper mines, where, due to hig …