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.
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Famous quotes containing the words fire and/or clay:
“And all shall be well and
All manner of thing shall be well
When the tongues of flame are in-folded
Into the crowned knot of fire
And the fire and the rose are one.”
—T.S. (Thomas Stearns)
“He is in the tailor mending my pantsuit.
He is in Boston, raised up by the skyscrapers.
He is in the bird, that shameless flyer.
He is in the potter who makes clay into a kiss.
Heaven replies:
Not so! Not so!”
—Anne Sexton (1928–1974)