Definition of scoria in English:

scoria

Line breaks: scoria
Pronunciation: /ˈskɔːrɪə
 
/

noun (plural scoriae /-rɪiː/)

[mass noun]
1Basaltic lava ejected as fragments from a volcano, typically with a frothy texture: chunks of black scoria [count noun]: the village lay half silted up under black scoriae and dust
More example sentences
  • They cut steps in the frozen snow and made good progress along a ridge of ‘rugged scoriae’ which took them to the summit.
  • Small vesicular pieces of volcanic material, scoria, collect around the vent to form a cinder cone.
  • Alluvial, colluvial or chemically formed gravel, clayey gravel, sandstone, limestone, tuff, scoria are examples of marginal materials.
2Slag separated from molten metal during smelting: the scoria has been expelled completely from the mercury

Origin

late Middle English (denoting slag from molten metal): via Latin from Greek skōria 'refuse', from skōr 'dung'. The geological term dates from the late 18th century.

Derivatives

scoriaceous

Pronunciation: /-ˈeɪʃəs/
adjective
More example sentences
  • The fine-grained ash groundmass contains equal proportions of scoriaceous tachylite and palagonite with basaltic lithic fragments.
  • On the western side of the mesa, black hornblende xenocrysts several centimeters in size are also found in a scoriaceous, agglomeratic portion of the lava flow.
  • Amygdaloidal cavities are located immediately below the uppermost scoriaceous part of the second flow, near its contact with the overlying flow.

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