Answer: scoria

AnswerCrossword Clue
SCORIA

Refuse of a smeltery.

SCORIA

Cellular lava

SCORIA

Smelter slag

SCORIA
Ore slag
SCORIA
Dross
SCORIASlag.
SCORIAMetal refuse.
SCORIALava.
SCORIAVolcanic cinder.
SCORIASlaggy lava.
SCORIASlag
SCORIARefuse from melting of metals.
SCORIALeftover of the smelting process.
SCORIACinders from a volcano.
SCORIADross; slag.
SCORIADross.
SCORIASmelting residue
SCORIAMetal dross
SCORIAFoolhardy
SCORIASmelting refuse