SCORIA
Scoria
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 ...The above text is a snippet from Wikipedia: Scoria
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scoria
Noun
- 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.
The above text is a snippet from Wiktionary: scoria
and as such is available under the Creative Commons Attribution/Share-Alike License.