http://resource.geosciml.org/classifier/cgi/commodity-code/palygorskite
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| definition | Palygorskite or attapulgite is a magnesium aluminium phyllosilicate with formula (Mg,Al)2Si4O10(OH)·4(H2O) that occurs in a type of clay soil common to the Southeastern United States. It is one of the types of fuller's earth. | ||||||
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| source | http://en.wikipedia.org/wiki/Attapulgite | ||||||
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