attapulgite clay
A fibrous claylike material, essentially ((OH
2 ) 4 Mg 5 Si
8 O 20 (OH) 2 --
4H 2 O), rich in magnesium, and used as
a filling material in papermaking, usually in
coatings for reproduction papers. The clay is also
called "fuller's earth," from its ability to
remove dirt and grease from wool, a process called
"fulling." (17 )
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