Clay Mineralogy and Soil Consistence

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Sheet Representation• Silicon-oxygen sheet• Aluminum-oxygensheet
Layers• Sheets joined by sharing oxygen atoms• 2 types– 1:1 – 1 sheet of silicon and oxygen and 1sheet of aluminum and oxygen– 2:1 – 2 sheets of silicon and oxygen and 1sheet of aluminum and oxygen
Page 3: What is a Sheet?• A flat array of
Page 7 and 8: 1:1 LayerSilicon-oxygen sheetAlumin
Page 9 and 10: 2:1 LayerSilicon-oxygen sheetAlumin
Page 12 and 13: Clay Particles• < 0.002 mm in dia
Page 14 and 15: Why is this important?• Shrink-sw
Page 16 and 17: .1941 (3)• Slightly expansive - S
Page 18: Moist Consistency• Moisten sample
Page 21 and 22: Suitable Moist Consistencies• Loo
Page 23: Stickiness• Thoroughly wet a samp
Page 26 and 27: Suitable Stickiness• Nonsticky -
Page 28: Plasticity• Thoroughly wet a samp
Page 31 and 32: Suitable Plasticity• Nonplastic -
Page 33 and 34: In the field, how do we know wehave

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