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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.
5) are usually angular and show different textures, from fluidal with phenocrysts of forsteritic olivine, to highly vesicular scoriaceous.
Scoriaceous or smooth, transparent as glass or light-denying as obsidian, the scarred features of their old age hold up a mirror to our fast-weathering faces.
Scoriaceous lithic ash, for example, was distinguished from juvenile glassy ash on the base of EDS analyses.
Albite is found as elongated microscopic blades on scoriaceous basalt.
A collection of 676 words from aa, a rough, scoriaceous lava, through to zz, a short buzzing or snoring sound.