What’s the difference between Bentonite and Montmorillonite?

 

Montmorillonite clays and Bentonite clays are one and the same thing. All types of Bentonite clays are grouped together under the Montmorillonite or Smectite group of clays. To speak of one is to speak of the other.

various brands have used different names for the same thing. This has caused confusion.

 

Montmorillonite was named after its discovery locality, Montmorillon, France in the 1800's. Bentonite was named after Fort Benton, Montana, near which it was discovered. Essentially, Bentonite and Montmorillonite are the same thing, with those specified as 100% Montmorillonite are the purest on the earth.

 

Bentonite is an absorbent aluminium phyllosilicate clay consisting mostly of montmorillonite. It was named by Wilbur C. Knight in 1898 after the Cretaceous Benton Shale near Rock River, Wyoming 

 

 Montmorillonite, a phyllosilicate, is a soft type of mineral that exists in small crystals which accumulate to form clay. Phyllosilicates or sheet silicates, are a group of minerals that include the mica, chlorite, serpentine, talc, and the clay minerals. The clay is named after Montmorillon (France) where it was first discovered.

Bentonite is an absorbent aluminium phyllosilicate clay consisting mostly of montmorillonite. It was named by Wilbur C. Knight in 1898 after the Cretaceous Benton Shale near Rock River, Wyoming 

 

There exist two types of Montmorillonite, sodium and calcium. Sodium Montmorillonite is commonly known as sodium Bentonite. The presence of sodium as the predominant exchangeable cation can result in the clay swelling to many times its original volume. Almost all natural clays have value in promoting human health. Some may be consumed, others are best used only externally, and some are best reserved for industrial purposes. 

[Ubick, Suzanne. "Mud, Mud, Glorious Mud". Magazine of the California Academy of Sciences. California Academy of Sciences. Retrieved 2012.]

 

References

http://durablehealth.net/