Coal

Coal

Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. Coal is composed primarily of carbon along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen.

Industry: Energy

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Coal

cap

Energy; Coal

Is usually referring to a miner's helmet or a blasting cap.

cap block

Energy; Coal

A flat object placed in between a prop and the roof to ensure proper support.

car

Energy; Coal

Refers to the wagon used to carry personal, coal or other materials.

carbide bit

Energy; Coal

A bit made by attaching molded tungsten carbide to a steel bit shank. It is used for cutting or drilling rock and coal. Also known as a cemented tungsten carbide.