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1. Loess

   Linked via "calcium carbonate nodules"

   While loess is often broadly defined by its silt content, the precise mineralogy dictates its engineering behavior and soil fertility. Standard loess typically contains between 10% and 40% clay minerals (predominantly illite and montmorillonite), 10% to 25% sand/very fine gravel (quartz), and the remainder being silt-sized quartz and [feldspar](/entri…