structural:expansion, structural:reformatting
Cultural usage

Coal is the official state mineral of Kentucky, and the official state rock of Utah and West Virginia. These US states have a historic link to coal mining.

Some cultures hold that children who misbehave will receive only a lump of coal from Santa Claus for Christmas in their stockings instead of presents.

It is also customary and considered lucky in Scotland and the North of England to give coal as a gift on New Year's Day. This occurs as part of first-footing and represents warmth for the year to come.