scoria

The type of volcanic rock with common vesicles is called scoria.

From Textbooks ● Jan. 1, 2017

Lank shadows and stocky, the fluttering shadows of dresses, the ridiculous elongated shadows of trousered legs, darted and danced last week all over the reddish scoria of the Roland Garros Stadium courts near Paris.

From Time Magazine Archive

The lime was added as a flux, and acted to unite with itself the sand, clay and other impurities to form a slag or scoria.

From Inventions in the Century by William Henry Doolittle

Westward, not a quarter of a mile from the house, behind a hedge of cottonwoods, the river swung in a long circle at the foot of steep buttes crested with scoria.

From Roosevelt in the Bad Lands by Hermann Hagedorn

That which is ejected from the chimney is called scoria as with other metals.

From De Re Metallica, Translated from the First Latin Edition of 1556 by Georgius Agricola

His passions are scoriae, his imagination a holocaust.

From Time Magazine Archive

How and why did they shape their scoriae colossi?

From Time Magazine Archive

Finally they emerged from the bush altogether, to find themselves breasting a steep slope, the soil of which was composed of fine scoriae and ashes.

From Dick Leslie's Luck A Story of Shipwreck and Adventure by Harold Piffard

In the first imperfect attempts the air was heated to little more than 80 degrees Fahrenheit, yet the results were satisfactory, and the scoriae from the furnace evidently contained less iron.

From Industrial Biography, Iron Workers and Tool Makers by Samuel Smiles

At different periods, and in different degrees of activity and force, the permanent volcanoes emit steam acids, luminous scoriae, or, when the resistance can be overcome, narrow, band-like streams of molten earths.

From COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1 by Alexander von Humboldt