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Silicates are the most abundant group of minerals in the Earth’s crust and their classification is primarily based on the arrangement of the silicon-oxygen tetrahedron (SiO₄)⁴⁻, which is the fundamental building block. In the structural classification of silicates, the connectivity of these tetrahedra determines the mineral group, physical ___ ________ _________ ______ ______ ___ ________ ______ _______ _________ ______ ________.
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