1. (n.) The recrement of metals in fusion, or the slag rejected after the reduction of metallic ores; dross.

2. (n.) Cellular slaggy lava; volcanic cinders.

aa abyssal rock alluvion alluvium ash ashes basalt bedrock block lava brand brash breccia calx carbon charcoal cinder clinker coal coke conglomerate coom crag deposition deposits diluvium draff dregs dross druid stone ember feces festooned pahoehoe froth fume gneiss granite grounds igneous rock lava lees limestone living rock loess magma mantlerock metamorphic rock monolith moraine offscum pahoehoe pillow lava porphyry precipitate precipitation pudding stone reek regolith rock ropy lava rubble rubblestone sandstone sarsen schist scree scum sediment sedimentary rock settlings shelly pahoehoe silt sinter slag smoke smudge smut soot stone sublimate sullage talus tufa tuff