A type of hard, fine-grained stone (usually a kind of sandstone or slate) that is blue or gray in color, commonly used for paving, building, or creating sidewalks and flagstones.
Compound of 'blue' + 'stone,' named for the blue-gray color of this sedimentary rock; commonly quarried in New York and Pennsylvania, and historically in other regions.
Bluestone is the building material that created Brooklyn and Philadelphia's iconic neighborhoods—those blue-gray stoops and sidewalks you see in old photos are bluestone, literally forming the foundation of entire American cities' identities and aesthetics.
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