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Unformatted text preview: sandwiching a sheet of alumina. Water and ions easily enter between the layers which causes these clays to shrink and swell. 4.3 Different types of clay minerals h A highly reactive (expansive) clay h montmorillonite family h used as drilling mud, in slurry trench walls, stopping leaks h (OH) 4 Al 4 Si 8 O 20 .nH 2 O high affinity to water Bentonite swells on contact with water Montmorillonite 2:1 Clay Mineral 4.3 Different types of clay minerals Si Al Si Si Al Si Si Al Si 0.96 nm joined by K + ions fit into the hexagonal holes in Si-sheet 2:1 Clay Mineral (e.g., illite) iIlite Source Markley., CA Source Siva 4.3 Different types of clay minerals Different combinations of tetrahedral and octahedral sheets form different clay minerals: We can distinguish tree main groups of clay minerals 1) 1: 1 clay minerals 2) 2: 1 clay minerals 3) 2:1:1 clay minerals...
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- Spring '11