Deskripsi coal:1.batuan: coal,shally coal,coally shale.2.warna: black,brown.3.kilap: 50-60%bright,60-70%bright.4.pecahan: flaty,concoidal,sub concoidal.5.kekerasan: soft,medium,hard. 6.belahan: horizontal fracture,vertical fracture.7.mineral: pyrite,resin.8.kondisi: solid,broken,semi broken.