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countable and uncountable, plural scorias or scoriae
The slag or dross that remains after the smelting of metal from an ore. quotations examples
The like stuff is in Anacharsis: hot metal; full of scoriae, which should and could have been smelted out, but which will not.
1837, Thomas Carlyle, The French Revolution: A History […], volumes (please specify |volume=I to III), London: Chapman and Hall, (please specify the book or page number)
(geology) Rough masses of rock formed by solidified lava, and which can be found around a volcano's crater. quotations
An excellent guidebook by Drs Kilburn and McGuire of University College London reveals that these unpromising pieces of debris are scoria and lithic fragments of the March 1944 eruption.
2004, Richard Fortey, The Earth, Folio Society, published 2011, page 10