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 ?
Unit D (24 cm): Brown scoriaceous bombs and lapilli with crude reverse grading, and an irregular horizon of hydrothermally altered lithics and small brown scoria (3-10 mm).
Unit F (94 cm) Deposit of gray laminated lapilli-bearing coarse ash layers showing plastic deformation, numerous block sags, and few scoriaceous bombs (< 5%).
Unit G (< 5 cm): Scoriaceous lapilli, laterally grading into 4 thin layers of lapilli-bearing-ash at some locations.
Unit J (< 24 cm): Massive tephra layer with blocks (<15 cm diameter), scoriaceous bombs (15-25 diameter) and lapilli-bearing (juvenile scoria, xenoliths and hydrothermally altered rocks) coarse ash layer with weak reverse grading.
In contrast to most northern New Jersey quarries, prehnite is uncommon at the Braen quarry, and its distribution is limited to the amygdaloidal and scoriaceous basalt overlying the pillow basalt complex; it is also found in the openings in diapirs.
Initially it was found as small translucent spheres and linings in cavities in the scoriaceous basalt, but large white to gray and cream-colored spheres up to 4 cm are now known.
Unit D is a relatively fresh, mostly dense but locally scoriaceous, porphyritic trachyandesite with ten to fifteen percent large plagioclase xenocrysts and phenocrysts.