In the eighteenth century, there was a white clay that bleached wool and degreased it, called smectite.
. Smectite
In the mid-19th century, a clay called montmorillonite was discovered in Montmorillon, France. Later, it was known that smectite and smectite were the same, so the name smectite was discarded. However, by the twentieth century, it was found that there are many minerals similar to the nature of montmorillonite, and they have to be called "montmorillon" or "montmorillonite". Given that these names are easily confused with each other. The International Clay Research Association Nomenclature Committee recommends re-using semectite as a general term. It includes two subfamilies of montmorillonite and saponite, hence the translation of "smectite".
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