Clay Mineralogy and Soil Consistence

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Friability• Loose• Very Friable• Friable• Firm• Very Firm• Extremely FirmMostly 1:1 claysMostly 2:1 clays
Suitable Moist Consistencies• Loose – s<strong>and</strong>-like• Very Friable – crushes under very gentlepressure• Friable – crushes under gentle ormoderate pressure• Firm – crushes under moderate pressurebut resistance is noticeable
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 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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