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Sandstone is a clastic sedimentary rock that is made up of cemented sand grains (usually quartz) and has a gritty feel to it.   this is the term uesed when sand has be â¦ en compacted together under such force so as to be turned into a solid mass rather than individual grains of sand. it looks weird.
The grains of sand of which sandstone is composed is the mineral quartz (SiO2). The quartz grains came from the weathering and erosion of igneous rocks, particularly granite, that have high amounts of quartz (granite is an intrusive igneous rock composed of feldspar, quartz and biotite mica).