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Bentonite

A rock subtype
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About BentoniteHide

An impure clay, primarily montmorillonite.
Originally described from Fort Benton shales, Wyoming, USA.


Unique IdentifiersHide

Mindat ID:
9141
Long-form identifier:
mindat:1:1:9141:7

Classification of BentoniteHide

Sub-divisions of BentoniteHide

Synonyms of BentoniteHide

Other Language Names for BentoniteHide

Dutch:Bentoniet
Estonian:Bentoniit
Farsi/Persian:بنتونیت
French:Bentonite
Hungarian:Bentonit
Indonesian:Bentonite
Italian:Bentonite
Polish:Bentonit
Portuguese:Bentonita
Romanian:Bentonit
Simplified Chinese:润土
膨润土
Swedish:Bentonit
Turkish:Bentonit

Varieties of BentoniteHide

Alkaline-earth bentoniteA bentonite containing easily exchangeable alkaline-earth cations and, either before or after acid treatment, capable of being made to assume properties of an alkali bentonite by treatment with an alkali salt followed by regulated dialysis.
Sodium-bearing BentoniteA high sodium variety of bentonite.

Common AssociatesHide

Associated Minerals Based on Photo Data:
2 photos of Bentonite associated with Precious OpalSiO2 · nH2O

Internet Links for BentoniteHide

References for BentoniteHide

 
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To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
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