scoriaceous

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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.

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  1. Made up of or resembling scoriæ; having a coarsely cellular structure: used chiefly with reference to lava. Portions [of lava] where the cells occupy about as much space as the solid part, and vary much in size and shape, are called scoriaceous, this being the character of the rough clinker-like scoriæ of recent lava streams. A. Geikie, Text-Book of Geol. (2d ed.), p. 94.

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Examples (18)

  • 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
 

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