The primary basis for classifying detrital rocks is particle size whereas the primary basis for classifying chemical rocks is mineral composition. About one-third of all known mineral species and 95% of the earth's crust are composed of silicate minerals, which are compounds with silica tetrahedra in their crystal lattice.
The amount of silica in rocks and mineral affects both their names and physical characteristics significantly. A mineral is a chemical compound that occurs naturally, is often crystalline, and has an abiogenic origin. A rock might be an accumulation of several minerals or mineraloids, whereas a mineral has a single, distinct chemical makeup.
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