Daily answer writing · Sun, 15 Nov, 2026
Silicates: classification by corner-sharing of SiO₄ tetrahedra, Si:O ratios and mineral examples
Classify silicates on the basis of the number of oxygen atoms of each SiO4 tetrahedron shared with neighbouring tetrahedra. Derive the formula of the repeating anion for each class and give one mineral example of each. Why does mica cleave into thin sheets whereas amphibole asbestos is fibrous?
Syllabus: Common to CSE Paper I, IFoS Paper I and Geo-Scientist Mains (inorganic): chemistry of main group elements, silicates and silicones, structures of silicate minerals.
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