Answer:

coal

Answer	Crossword Clue
COAL	Fossil fuel
COAL	Fuel
COAL	Furnace fuel

COAL	Train fuel, once
COAL	Newcastle item
COAL	Tender cargo
COAL	Wyoming resource
COAL	Fuel source
COAL	Scuttle load
COAL	Future diamond
COAL	Anthracite

COAL	What Loretta's pa mined
COAL	Frosty's eyes
COAL	Seam contents
COAL	Stocking stuffer, maybe
COAL	Newcastle output
COAL	Brat's stocking stuffer
COAL	Chunk that glows
COAL	Newcastle product

COAL	Eyes for Frosty?
COAL	Kentucky resource
COAL	Stuff in a seam
COAL	Bad child's gift
COAL	World's largest source of electricity
COAL	What "cinder concrete" contains
COAL	Unwelcome stocking stuffer
COAL	Barbecue nugget

COAL	One of the fossil fuels
COAL	Tar source
COAL	Energy source
COAL	Christmas stocking punishment
COAL	Part of Frosty's makeup
COAL	Beehive oven input
COAL	Lignite, for one
COAL	Briquette

COAL	Annual sign of bad behavior?
COAL	Pennsylvania resource
COAL	West Virginia resource
COAL	Historic Newcastle resource
COAL	Combustible mineral