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Clay minerals are classified structurally as

  • A.layered aluminosilicates built from sheets
  • B.chain silicates in the manner of the pyroxenes
  • C.framework silicates in the manner of the feldspars
  • D.isolated silicate tetrahedra with no linkage

Answer: A

Tetrahedral silica sheets and octahedral alumina sheets stack in characteristic ways, and it is the layered habit that gives clay its plate-like particles. Feldspar and quartz are framework structures and behave quite differently. Slip rheology depends on both charges acting together.

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