scoriaceous

• Professor Judd says:[19] "The most interesting fact with regard to the constitution of these Hungarian lavas, which in the central parts of their masses are often found to assume a very coarsely crystalline and almost granitic character, while their outer portions present a strikingly scoriaceous or slaggy appearance, remains to be noticed. —  Round About the Carpathians
• In a pile of successive sheets of lava each flow may be distinguished and its thickness measured; for the surface of each sheet is glassy and scoriaceous, while beneath its upper portions the lava of each flow is more dense and stony. —  The Elements of Geology
• They are never scoriaceous, for the steam with which they were charged was not allowed to expand and distend them with steam blebs. —  The Elements of Geology
• It is covered with short, yellowish grass through which the burnt-up, scoriaceous lava rock protrudes in rough masses. —  Travels in West Africa
• Near them is the red sandstone, lying under the basalt, and baked to a scoriaceous cinder. —  Scientific American Supplement, No. 363, December 16, 1882

Allen's Synonyms and Antonyms