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Bluestone is a colloquial or convenience label to rocks with blue-gray shades of colors rather than a geological term. In Britain, once upon a time, all imported stones at Stonehenge were referring Bluestones. In the USA, sandstone from Pennsylvania and New York, and Limestone from the Shenandoah Valley are Bluestones. Basalt in Australia and New Zealand, Dolerites in Tasmania, Feldspathic sandstone in Canada, and sometimes Slate in South Australia are known as Bluestone among the end-users and contractors.

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