472 REPORT ON NATIONAL MUSEUM, 188G. 



carved upon it. The material first derived its notoriety from the fact 

 that the Sioux Indians utilized it for the manufacture of their pipes 

 and various other articles, and at the present time these same people 

 living in the vicinity of Fiandreau, Dak., derive a considerable income 

 from the manufacture and sale of these articles. 



Owing- to the fact that the material occurs only in a thin bed under- 

 lying the hard and tough red quartzite of the vicinity, it can, with the 

 present facilities for extraction, be obtained in blocks of only very mod- 

 erate dimensions. Its color is such, however, that in proper combina- 

 tions it could be used very advantageously in interior decorations. The 

 principal source of the material is near Pipe Stone City, in Pipe Stone 

 County, Minn.* 



* See Geol. of Minnesota, Vol. i ; also Am. Jour. Sci., lo67, p. 15, and Am. Natural- 

 ist, 1868-'69. 



