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catlinite
Catlinite (also called pipestone) is a type of argillite (metamorphosed mudstone), usually brownish-red in color, which occurs in a matrix of Sioux Quartzite. Because it is fine-grained and easily worked, it is prized by Native Americans, primarily those of the Plains nations for use in making ceremonial pipes such as chanunpas. Pipestone quarries are located and preserved in Pipestone National Monument outside of Pipestone, Minnesota, in Pipestone County, Minnesota, and at the Pipestone River in Ontario, Canada.
==Name==
The term ''Catlinite'' came into use after the American painter George Catlin visited the quarries in Minnesota in 1835; but it was Philander Prescott who first wrote about the rock in 1832, noting that evidence indicated that American Indians had been using the quarries since at least as far back as 1637.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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