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n. pl. sco·ri·ae (skôr′ē-ē′)
1. Geology Porous cinderlike fragments of dark lava. Also called cinders, slag.
2. Metallurgy The refuse of a smelted metal or ore; slag. Also called cinder.

[Middle English, dross, from Latin scōria, from Greek skōriā, from skōr, excrement, dung; see sker- in Indo-European roots.]

sco′ri·a′ceous (-ā′shəs) adj.
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References in classic literature ?
It is interesting to trace the changes produced by the heat of the overlying lava, on the friable mass, which in parts has been converted into a crystalline limestone, and in other parts into a compact spotted stone Where the lime has been caught up by the scoriaceous fragments of the lower surface of the stream, it is converted into groups of beautifully radiated fibres resembling arragonite.
A collection of 676 words from aa, a rough, scoriaceous lava, through to zz, a short buzzing or snoring sound.
Unit D rests on Unit A west and north of Cerro Castellan, to the point one mile northwest of the Cerro where it ends in a blunt scoriaceous mass that buttresses and is overlapped by Unit F.