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
Allotropes of carbon Instead they were called zeolite-templated carbons (ZTCs). The name derives from their origin inside the pores of zeolites, crystalline silicon dioxide minerals. Another team recognized them as schwarzites and refined the original synthesis technique. A vapor of carbon-containing molecules is injected into the zeolite, where the carbon gathers on the pores' inner walls. It forms a 2D sheet that pulls inwards, creating the negative curve. Dissolving the zeolite leaves the carbon. Glassy carbon or vitreous carbon is a class of non-graphitizing carbon widely used as an electrode material in electrochemistry, as well as for high-temperature crucibles and as a component