Some soils in arid and semi-arid areas contain palygorskite in their clay fraction. The absence of palygorskite in soils in humid areas is attributed to the acid nature of these soils. Palygorskite is known to be unstable even in very dilute acid (Singer, 1977). As shown recently, decomposition of palygorskite occurs also under neutral conditions (Neaman and Singer, 2000).

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Palygorskite is the most Mg-rich among common clay minerals (Singer, 1989). Based on leaching experiments of palygorskite, Mg is preferentially released into solution over Fe and Al under both acid and neutral conditions (Abdul-Latif...

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