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Scoriaceous

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sco·ri·a  (skôr-, skr-)
n. pl. sco·ri·ae (skôr-, skr-)
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 scria, from Greek skri, from skr, excrement, dung; see sker-3 in Indo-European roots.]
scori·aceous (-shs) adj.
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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.
The Voyage of the Beagle by Darwin, Charles View in context
 
 
 
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