Fire Clay
Underclay, which consists of siliceous refractory clay rich in hydrous aluminium silicates, is also called fireclay. Just as not all underclays are fireclays, not all fireclays are underclays. Within Carboniferous and other coal bearing strata, fireclay quite commonly comprises many underclays. In Great Britain underclays, which are 1 to 3 metres ( 3 to 9 feet) thick, are major source of commercial fireclay deposits. The alteration of sediments by weathering, plants, and other soil processes comprising underclay resulted in the formation of vast majority of fireclay that comprises underclay.
Read more about this topic: Seatearth
Famous quotes containing the words fire and/or clay:
“Boys, when you see the enemy, fire and then run, and as I am a little lame, I will run now.”
—For the State of Rhode Island, U.S. public relief program (1935-1943)
“Archaeologists have uncovered six-thousand-year-old clay tablets from southern Babylonia that describe in great detail how the adults of that community found the younger generation to be insolent and disobedient.”
—Lawrence Kutner (20th century)