Anthracite Mohs scale), its higher relative density of 1.3–1.4, and luster, which is often semi-metallic with a mildly brown reflection. It contains a high percentage of fixed carbon and a low percentage of volatile matter. It is also free from included soft or fibrous notches and does not soil the fingers when rubbed. Anthracitization is the transformation of bituminous coal into anthracite. The moisture content of fresh-mined anthracite generally is less than 15 percent. The heat content of anthracite ranges from 22 to 28 million Btu per short ton (26 to 33 MJ/kg) on a moist, mineral-matter-free basis. The heat content
Coal-fired pizza Coal-fired pizza Coal-fired pizza is a pizza style in the United States. New York-style pizza and New Haven-style pizza are often cooked in coal-fired pizza ovens. A coal-fired oven can reach and cook a pie in two to three or five minutes. Pizzarias outside of the Northeastern United States that feature coal-fired oven are uncommon enough to be noted in travel guides: for instance, Black Sheep Pizza with the first coal-fired oven in Minneapolis, or URBN in San Diego. As of 2007, coal-fired ovens were quite uncommon in the Western United States with only five west of the Mississippi: four