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Scoria \Sco"ri*a\, n.; pl. Scori[ae]. [L., fr. Gr. ?, fr. ? dung, ordure.]

  1. The recrement of metals in fusion, or the slag rejected after the reduction of metallic ores; dross.

  2. Cellular slaggy lava; volcanic cinders.


n. 1 The slag or dross that remains after the smelting of metal from an ore. (from 14th c.) 2 (context geology English) Rough masses of rock formed by solidified lava, and which can be found around a volcano's crater. (from 18th c.)

  1. n. the scum formed by oxidation at the surface of molten metals [syn: slag, dross]

  2. [also: scoriae (pl)]


Scoria is a highly vesicular, dark colored volcanic rock that may or may not contain crystals ( phenocrysts). It is typically dark in color (generally dark brown, black or purplish red), and basaltic or andesitic in composition. Scoria is relatively low in density as a result of its numerous macroscopic ellipsoidal vesicles, but in contrast to pumice, all scoria has a specific gravity greater than 1, and sinks in water. The holes or vesicles form when gases that were dissolved in the magma come out of solution as it erupts, creating bubbles in the molten rock, some of which are frozen in place as the rock cools and solidifies. Scoria may form as part of a lava flow, typically near its surface, or as fragmental ejecta (lapilli, blocks and bombs), for instance in Strombolian eruptions that form steep-sided scoria cones. Most scoria is composed of glassy fragments, and may contain phenocrysts. The word scoria comes from the Greek σκωρία, skōria, rust. An old name for scoria is cinder.

Scoria (disambiguation)

Scoria is a type of vescular volcanic rock

Scoria, (plural Scoriae) may also refer to:

  • Scoria (wrestler), Mexican wrestler, also known as Escoria
  • Elvis Scoria, Croatian football player
  • Slag, or other waste from iron production

Usage examples of "scoria".

Rings of pale-coloured scoria may be due to tin, zinc, antimony, or arsenic.

The cupellation of large quantities of alloy or of alloys which contain tin, antimony, iron, or any substance which produces a scoria, or corrodes the cupel, must be preceded by a scorification.

The eruption caught the Borg ship in a giant thermocautery and turned it into so much scoria in a half second.

Scoriae, in a state of dust, like powdered pumice-stone, and grayish ashes as small as the finest feculae, were held in suspension in the midst of their thick folds.

As the cruiser glides closer to the rimlands of smeared lava flats and scoria, he sees the famous veins of dried riverbeds that he remembers from the Viking photographs of his former life a millennium ago.

Here and there, treacherous rubbles of scoria underfoot made each step uncertain.

Covenant lashed argent at them, sent them sprawling, reduced their rukhs to scoria.

He'd demanded a fresh supply while meditating at the place of the Pivot, only to get back to Yzordderrex to find that his procurers in the Scoriae Kesparate had been murdered.

There were questions to be answered here, and quickly, or else it wouldn't only be the Scoriae where heads would roll.

So much smoke, and possibly scoriae and cinders were mingled with them, that their light gleamed but faintly amid the gloom of the night.

For a long way the soil was composed of a reddish sandy stone, something like crushed brick, scoriae, streams of lava, and pumice-stones.

We are about to be expelled, thrown up, vomited, spit out of the interior of the earth, in common with huge blocks of granite, with showers of cinders and scoriae, in a wild whirlwind of flame, and you say—the most fortunate thing which could happen to us.

The column of cinders, of scoriae, of broken rocks and earth, had wholly ceased to ascend.

Hence the numerous heaps of scoriae found in the neighbourhood of Leeds,— at Middleton, Whitkirk, and Horsforth— all within the borough.

The foot-blasts of the earlier iron-smelters were so imperfect that but a small proportion of the ore was reduced, so that the iron-makers of later times, more particularly in the Forest of Dean, instead of digging for ironstone, resorted to the beds of ancient scoriae for their principal supply of the mineral.