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Etimologi
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coal iku combustible-ireng coklat ireng utawa sedimentary rock biasane kedadean ing parang tingkat ing lapisan sing disebut kasur coal
saka col term english lawas, kang wis temenan Mineral karbon fosil wiwit abad kaping 13
rock grained coarse, rock grained nggoleki, medium rock grained, rock opaque
tachylite punika wangun vitreous saka kaca vulkanik basaltic. kaca iki alami dening cooling kanthi cepet saka basalt molten
saka tachylite german, saka tachy- + lutos greek telat, leleh
awet rock, medium atose rock
rock grained coarse, rock grained nggoleki, medium rock grained, rock opaque