Definitions for scoriaˈskɔr i ə, ˈskoʊr-; ˈskɔr iˌi, ˈskoʊr-
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slag, scoria, dross(noun)
the scum formed by oxidation at the surface of molten metals
The slag or dross that remains after the smelting of metal from an ore.
Rough masses of rock formed by solidified lava, and which can be found around a volcano's crater.
Origin: From scoria, from σκωρία, from σκῶρ.
the recrement of metals in fusion, or the slag rejected after the reduction of metallic ores; dross
cellular slaggy lava; volcanic cinders
Origin: [L., fr. Gr. , fr. dung, ordure.]
Scoria is a highly vesicular, dark colored volcanic rock that may or may not contain crystals. It is typically dark in color, and basaltic or andesitic in composition. Scoria is relatively low in mass 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, 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.
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