a pile of lumps of black coal or charcoal. a combustible natural resource. texture for energy, fuel and raw material .

coal black charcoal solid natural resource chunks pile heap lots bulk mass industry mineral stone textured fuel background material rock exploitation fossil carbon production geology closeup abstract piece macro organic abundance metallurgical rough lignite manufacturing combustible firewood stack power raw extraction quarrying ballast anthracite bituminous dark illustration lumps texture for energy concepts banner poster cover brochure presentation charcoal resource concepts presentation