Page 529
layers that can be seen today in the badlands areas. Bentonite is composed principally of the clay mineral montmorillonite, which if it contains sodium as an exchangeable ion, can swell conspicuously when wet; calcium bentonites are only slightly swelling or non-swelling. The Sentinel Butte bentonit...
| Language: | unknown |
|---|---|
| Subjects: | |
| Online Access: | http://cdm16921.contentdm.oclc.org/cdm/ref/collection/ndbb/id/13286 |