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Cation-poor sheet silicates

Connection of the layers in (d) cation-poor sheet silicates, (e) cation-rich sheet silicates. Octahedron vertices that do not act as common vertices with tetrahedra are occupied by OH- ions... [Pg.183]

The sheets consisting of tetrahedron-octahedron-tetrahedron layers in cation-poor sheet silicates are completely planar due to the symmetrical environment of the cation layer. If the sheets are electrically neutral as in talc, the attractive forces between them are weak as a consequence, the crystals are soft and easy to cleave. The use of talc as powder, lubricating agent, polishing material and filling material for paper is due to these properties. [Pg.183]

Clay materials show a different behavior. They are either cation-poor or cation-rich sheet silicates. They can swell by taking up varying amounts of water between the sheets. If the intercalated cations are hydrated as in montmorillonite, they act as cation exchangers. Montmorillonite, especially when it has intercalated Ca2+ ions, has thixotropic properties and is used to seal up drill holes. The effect is due to the charge distribution on... [Pg.183]

See other pages where Cation-poor sheet silicates is mentioned: [Pg.183]    [Pg.183]    [Pg.184]    [Pg.184]    [Pg.183]    [Pg.183]    [Pg.184]    [Pg.184]    [Pg.183]    [Pg.183]    [Pg.184]    [Pg.184]    [Pg.183]    [Pg.183]    [Pg.184]    [Pg.184]    [Pg.38]    [Pg.443]    [Pg.3761]    [Pg.140]    [Pg.264]    [Pg.51]   
See also in sourсe #XX -- [ Pg.183 ]

See also in sourсe #XX -- [ Pg.183 ]



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