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

Even the scoria, or slag from the furnaces, has been found to be good for something, and now it is made into a coarse sort of brick that for certain rough uses is of value.

From Diggers in the Earth by Eva March Tappan

The non-metallic particles being brought to a state of fusion by the constant action of four pair of hand-worked bellows, the iron with the scoria sinks to the bottom.

From The Highlands of Ethiopia by William Cornwallis Harris

There is plain evidence of these volcanic cones and craters having discharged basalt, lava, scoria, cinders, and the like within a comparatively modern period.

From Under the Southern Cross or Travels in Australia, Tasmania, New Zealand, Samoa, and Other Pacific Islands by Maturin Murray Ballou

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

The first of these shows no sign of either lavas or scoriae, but volcanic rocks occur on the margins of the other two.

From Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" by Various

It has been found profitable to resmelt the scoriae of the ancient workings.

From Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 4 "Grasshopper" to "Greek Language" by Various

Hence the numerous heaps of scoriae found in the neighbourhood of Leeds,—at Middleton, Whitkirk, and Horsforth—all within the borough.

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