Unformatted text preview: Soil Chemistry 2010 Name__________________
Wednesday, September 22, 2010 1. (30) What are three ways that layer silicates can be differentiated from each other? 2. (15) List three properties of ‘smectites’, or 2:1 phyllosilicates with low layer charge. 3. (50) Match the phyllosilicate minerals with the characteristics that best describe them.
a. Mica ____ 2:1 layer mineral with no substitution and no layer charge b. Kaolinite ____ High layer charge 2:1 phyllosilicate with low CEC c. Pyrophyllite ____ Medium charge 2:1 clay mineral that can ‘fix’ K+ d. Vermiculite ____ 2:1 layer mineral with an octahedral sheet in the interlayer e. Chlorite ____ 1:1 non-expanding layer silicate with very low CEC 4. (5 points) What is one source of charge (either negative or positive) on soil clay particles? 5. (Extra credit) Write and correctly answer one question you thought should be on this quiz. ...
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- Spring '10
- Silicate minerals, layer charge, b. Kaolinite, c. Pyrophyllite, low layer charge, High layer charge