Here it is proper to observe, that the Sea-salt doth not mix with the scoria, but floats upon it.
The telescope reveals a parapet of scoria on the brim, as on Teneriffe.
The Spaniards traversed the country of a cacique, scoria, and arrived at the residence of another called Pariza.
On approaching nearer the apex, the path was over cinders, fine black sand, and scoria.
The dull red colour of the scoria gives one the impression that the flames have been of very recent date.
Sometimes it resembled a spiders web in appearance, sometimes soot deposited in the cavities of the scoria.
We crossed several dykes of lava and scoria, and wide mud-torrents now dry, the outpourings of a volcano long since extinct.
We passed along the tolerably high dam, while the scoria rolled regularly off the sides at our feet.
Tolouse calculated that similar heaps in Gaul contained over 120,000 tons of scoria.
This hearth is filled with charcoal and dross, or scoria; and upon these is laid the metal and more coal.