Brownstone Specialist.
Brownstone is a brown Triassic–Jurassic[1][2] sandstone that was historically a popular building material. The term is also used in the United States and Canada to refer to a townhouse clad in this or any other aesthetically similar material.
Brownstone, also known as freestone because it can be cut freely in any direction, was used by early Pennsylvanian Quakers to construct stone mills and mill houses.
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