Clay Mineralogy and Soil Consistence

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Unsuitable Moist Consistencies• Very Firm – crushes under strongpressure, barely crushable• Extremely Firm – crushes only under verystrong pressure; cannot be crushedbetween thumb and forefinger
Stickiness• Thoroughly wet a sample of soil• Place between thumb and forefinger• Gently pull apart fingers• Amount of soil on both thumb andforefinger determines the stickiness
Page 3 and 4: What is a Sheet?• A flat array of
Page 5 and 6: Layers• Sheets joined by sharing
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: Suitable Moist Consistencies• Loo
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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