Aggregate (geology)
Mass of rock, gravel, sand, soil particles, or of minerals in a rock / From Wikipedia, the free encyclopedia
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In the Earth sciences, aggregate has three possible meanings.
In mineralogy and petrology, an aggregate is a mass of mineral crystals, mineraloid particles or rock particles.[1][2] Examples are dolomite, which is an aggregate of crystals of the mineral dolomite,[3] and rock gypsum, an aggregate of crystals of the mineral gypsum.[4] Lapis lazuli is a type of rock composed of an aggregate of crystals of many minerals including lazurite, pyrite, phlogopite, calcite, potassium feldspar, wollastonite and some sodalite group minerals.[5]
In the construction industry, an aggregate (often referred to as a construction aggregate) is sand, gravel or crushed rock that has been mined or quarried for use as a building material.
In pedology, an aggregate is a mass of soil particles. If the aggregate has formed naturally, it can be called a ped; if formed artificially, it can be called a clod.[6]