To the east was a morass, and beyond the morass were the blue waters of Lake Chalco; while to the west the Pedregal, a barren tract of volcanic Scoriae, over whose sharp rocks and deep fissures neither horse nor vehicle could move, flanked the American line of march.
"Stonewall Jackson And The American Civil War"
G. F. R. Henderson
On reaching the sea the water, of course, began to boil violently, and clouds of steam arose, carrying with them particles of Scoriae.
"Complete Story of the San Francisco Horror"
Richard Linthicum Trumbull White Samuel Fallows
There was light pumice everywhere, but nothing like recent lava or Scoriae.
"Unbeaten-Tracks-in-Japan"
Bird, Isabella L. (Isabella Lucy)