What does scoriaceous mean?
Scoriaceous is a technical adjective describing rock or other material that resembles scoria. Scoria is the dark, porous, vesicular material produced when gas escapes from molten lava, leaving cavities in the solidified rock. The adjective can therefore characterize either material made chiefly of scoria or a rock with a similarly dark, slag-like, or porous texture. It appears in geological descriptions of volcanic deposits, lava flows, volcanic cones, and scoria-rich layers, but it is not ordinarily used in everyday speech. The word is related to scoria, a term borrowed from Italian and ultimately connected with Latin vocabulary for dross, refuse, and burnt residue. Scoriaceous is easily confused with scorpion-related adjectives, but its geological sense concerns the characteristic structure of volcanic material rather than arachnids.
adjectiveResembling or consisting of scoria; of the nature or texture of dark, vesicular volcanic material.
- Consisting of, resembling, or having the characteristic texture of scoria.
"The eruption left a layer of scoriaceous lava across the valley floor."
"A geologist described the dark, scoriaceous lava that surrounded the vent."
"The quarry exposed a scoriaceous layer containing fragments of dark volcanic rock."
Scoriaceous is a geological word with an Italian ancestor: scoria once referred to the dark dross or refuse left behind by fire.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does scoriaceous come from?
Scoriaceous was formed in English from scoria and the suffix -aceous, meaning “having the nature or form of.” Scoria comes through Italian from Latin scoria, “refuse, dross,” a word associated with Greek skor, “dregs or rubbish.” The same root also underlies the English verb scorify and the related noun scorification.
How scoriaceous is actually used
This is a rare specialist term used chiefly in geology, mineralogy, and descriptions of volcanic materials. It is uncommon in general writing.
Easily confused with scoriaceous
Scoriaceous describes material resembling scoria, whereas scorpiaceous means resembling or relating to scorpions.