Classification sorts earth materials by their formal mineral family. Wikipedia notes that quartz "is classified structurally as a framework silicate mineral and compositionally as an oxide mineral," two different systems applied to the same substance. This dimension lets a visitor compare materials that mineralogists group together for the same technical reason.
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Formation OriginFormed by the cementation of accumulated mineral or organic sediment particles at the surface. 1 Sedimentary Rock
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1. Wikipedia: Sedimentary rock
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Sedimentary rocks are types of rock formed by the cementation of sediments-i.e. particles made of minerals (geological detritus) or organic matter (biological detritus)-that have been accumulated or deposited at Earth's surface.
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