scoria

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scoria:

see pumicepumice
, volcanic glass formed by the solidification of lava that is permeated with gas bubbles. Usually found at the surface of a lava flow, it is colorless or light gray and has the general appearance of a rock froth.
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scoria

[′skȯr·ē·ə]
(geology)
Vesicular, cindery, dark lava formed by the escape and expansion of gases in basaltic or andesitic magma; generally denser and darker than pumice.
(materials)
Refuse after melting metals or reducing ore.

scoria

1. A dark, cellular volcanic rock.
2. Blast-furnace slag or scum.

scoria

1. a rough cindery crust on top of solidified lava flows containing numerous vesicles
2. refuse obtained from smelted ore; slag
References in periodicals archive ?
In contrast with rather weathered scoriae of Cerro La Culebra and Loma La Culebra, both covered by vegetation, the scoria cone Cerro Ostua shows low degree of weathering and scarce vegetation (Fig.
Fall out scoriae preserved between lava flows are exposed occasionally in the road cuts, for example on the road Caserio Matalapa--Sitio El Manguito, about 13 km west of Metapan.