a bluish, argillaceous sandstone used for building purposes, flagging, etc.
Contemporary Examples

Jimmy Breslin on JFK’s Assassination: Two Classic Columns Jimmy Breslin November 21, 2013

Historical Examples

Slave Narratives: A Folk History of Slavery in the United States From Interviews with Former Slaves Work Projects Administration
A Virginia Scout Hugh Pendexter
Things a Boy Should Know About Electricity Thomas M. (Thomas Matthew) St. John
A Virginia Scout Hugh Pendexter
Special Report on Diseases of the Horse United States Department of Agriculture
Archaic England Harold Bayley
The Dark Star Robert W. Chambers
Lady Anna Anthony Trollope
Old Man Curry Charles E. (Charles Emmett) Van Loan

a blue-grey sandstone containing much clay, used for building and paving
the blue crystalline form of copper sulphate
a blue variety of basalt found in Australia and used as a building stone


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