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Essay / Research Paper Abstract
A 3 page paper discussing the aluminum and silicon content of several rock-forming minerals and assessing factors contributing to weathering into kaolinite, montmorillonite, illite or vermiculite clay types based on silicon and aluminum content. Bibliography lists 5 sources.
Page Count:
3 pages (~225 words per page)
File: CC6_KSrockWthr.rtf
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Unformatted sample text from the term paper:
points of clay soils include their small particle size, inorganic composition and origin in clay-containing sedimentary rock. Shale is the most common of the rocks from which we gain
clay soils, but clay minerals occur "in minor amounts in all sedimentary rocks" (Weathering and Sedimentary Rocks, n.d.). Weathering Possibilities Information given is
presented in Figure 1, which is a logarithmic chart of the values provided. Figure 1. Logarithmic Chart of Mineral Ratios
Table 1 provides the aluminum and silicon content of the rock-forming minerals provided and included in Figure 1. As can be
seen from the table, olivine and hypersthene contain no aluminum at all and so cannot weather directly into any type of clay containing both aluminum and silicon. Table 1.
Aluminum and Silicon Content of Selected Rock-Forming Minerals Aluminum Content Silicon Content Muscovite 20.30% Al 38.36% Al2O3 21.13% Si 45.21% SiO2 Biotite 6.22%
Al 11.76% Al2O3 19.44% Si 41.58% SiO2 Olivine 18.32% Si 39.19% SiO2 Hypersthene 24.18% Si 51.73% SiO2 Augite 4.57%
Al 8.63% Al2O3 22.58% Si 48.30% SiO2 Magnesiohornblende 5.75% Al 10.86% Al2O3 23.94% Si 51.22% SiO2 Orthoclase 9.69% Al 18.32% Al2O3 30.27%
Si 64.76% SiO2 Albite 10.77% Al 20.35% Al2O3 31.50% Si 67.39% SiO2 Anorthite 18.97% Al 35.84% Al2O3 20.75% Si 44.40% SiO2 Kaolinite 20.9%
Al 39.5% Al2O3 21.76% Si 46.55% SiO2 Montmorillonite 9.83% Al 18.57% Al2O3 20.46% Si 43.77% SiO2 Illite 9.01% Al 17.02% Al2O3 25.25%
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