• WordNet 3.6
    • n gritstone a hard coarse-grained siliceous sandstone
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Webster's Revised Unabridged Dictionary
    • n Gritstone (Geol) See Grit n., 4.
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Century Dictionary and Cyclopedia
    • n gritstone Same as grit, 3.
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In literature:

These generally belong to the hard gritstone of the moors through which Newton Dale has been carved.
"The Evolution Of An English Town" by Gordon Home
It is built in the ornamented parts and internally of Bath stone, the exterior being the gritstone of the neighbourhood.
"The Forest of Dean An Historical and Descriptive Account" by H. G. Nicholls
It is of gritstone, but has been much altered and repaired at later periods, when limestone has been used.
"Bell's Cathedrals: The Cathedral Church of Ripon" by Cecil Walter Charles Hallett
The two colossi on the plain of Thebes are, of course, hard gritstone.
"Museum of Antiquity" by L. W. Yaggy
They consist of a series of sandstones, gritstones, conglomerates, shales, limestones, etc.
"Sea-Weeds, Shells and Fossils" by Peter Gray