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Mexico City is built on the sediments of the former Texcoco lake (Ex-Lago de Texcoco), which are characterised by the presence of a siliceous deposit, up to 70 m in thickness, called “jaboncillo” (like soap).The jaboncillo is composed dominantly of amorphous silica and iron oxides and hydroxides, with minor amounts of phyllosilicates and detrital volcanic minerals. The mineralogy, the micromorphology...