“ASH” – culm (fraction 0-6 mm) “AS” – pea-anthracite (fraction 6 -13 mm) “AM” – small anthracite (fraction 13 – 25 mm) “AK” – anthracite fist (fraction 50 – 100 mm) “AKO” – nut coal (fraction 25 – 100 mm) All kinds of coal in high content of fixed carbon (91-98%), low content of moisture, sulphur, volatile matter and high specific heat of burning. Anthracite burns quickly without smoke or flame, has high heat emission, is noncoking. It has high density of organic matter (1500-1700 kg/m3) and high electroconductivity. Hardness according to Mohs scale is 2,0 - 2,5.