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countable and uncountable, plural sandstones
A sedimentary rock produced by the consolidation and compaction of sand, cemented with clay etc. quotations examples
It spread slowly up from the sea-rim, a welling upwards of pure white light, ghosting the beach with silver and drawing the grey bastions of sandstone out of formless space.
1938, Norman Lindsay, Age of Consent, 1st Australian edition, Sydney, N.S.W.: Ure Smith, published 1962, page 32