scoria Synonyms

dross slag soot sinter sediment scum block lava scobs rubblestone rubble refuse recrement sprue tachylyte trash ballast stone volcano matter pudding stone Cinders abyssal rock pillow lava grounds volcanic rock bedrock dregs waste porphyry pahoehoe obsidian carbon calx breccia brash brand bitumen basalt ashes ash anthracite alluvium charcoal cinder magma lees lava impurity ember diluvium culm coulee