pipestone

A few days later two solitary teepees stood on the shore of the pond, under the red cliffs of the Pipestone Quarry.

They are chiefly made of a soft stone something like the pipestone used by the present Indians which approaches soapstone.

All tribes, even those at war, could claim asylum at the red pipestone.

Lewis drew forth his imposing calumet of red pipestone and lighted it.

Here they remained for a day quarrying pipestone and fashioning pipes.