| The most recent and public difference of opinion over sacredness occurred just this summer, and it concerned a substance called pipestone. |
| Various analyses of numerous Havana Hopewell platform pipes from Illinois revealed most to be made of Elkhorn Creek pipestone. |
| After passing the pipestone falls, we entered country new to us, where the valley became much wider. |
| Our preliminary work has shown it to be highly accurate in identifying such pipestones as catlinite, Sterling pipestone, and Missouri flint clay. |
| A stone from Ohio, for pipestone from Dakota, or for a stone from any other State. |
| A similar situation exists with the Mississippian figurines of flint clay that are often misidentified as bauxite or pipestone. |
