Aggregate (geology)

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Crystal aggregate (lapis lazuli from Afghanistan) Lapislazuli from Afghanistan other view.jpg
Crystal aggregate (lapis lazuli from Afghanistan)
Construction aggregate (a gravel pit in Germany) Kiesabbau Forstenrieder Park.jpg
Construction aggregate (a gravel pit in Germany)
Soil aggregate in Spain Subangular Blocky Soil Aggregate in Spain.jpg
Soil aggregate in Spain

In the Earth sciences, aggregate has three possible meanings.

Contents

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, which is an aggregate of crystals of the mineral gypsum. [4] Lapis lazuli, for another example, 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 pedology, an aggregate is a mass of soil particles. If it has formed naturally, it can be called a ped; if formed artificially, it can be called a clod. [6]

In the construction industry, in contrast to the Earth sciences, an aggregate (often referred to as construction aggregate) is sand, gravel or crushed rock that has been mined or quarried for use as a building material.

Construction aggregate examples

Use in industry

Aggregates are used extensively in the construction industry. [9] [10] Often in making concrete, a construction aggregate is used, [4] with about 6 billion tons of concrete produced per year. [11]

See also

References

  1. ↑ Neuendorf, K.K.E.; Mehl, J.P. Jr.; Jackson, J.A., eds. (2005). Glossary of Geology (5th ed.). Alexandria, Virginia: American Geological Institute. p. 11.
  2. ↑ Abel, Mara; Lorenzatti, Alexandre; Rama Fiorini, Sandro; Carbonera, Joel (2015). Ontological analysis of the lithology data in PPDM well core model. PNEC Conferences. Houston. p. 3. Retrieved 27 March 2017.
  3. ↑ Teichert, Curt (1965). Devonian Rocks and Paleogeography of Arizona (US Geological Survey Professional Paper 464) (PDF). Washington DC: USGS. p. 150.
  4. 1 2 Jessica Elzea Kogel (2006). Industrial Minerals & Rocks: Commodities, Markets, and Uses (7th ed.). SME. p. 522. ISBN   978-0-87335-233-8.
  5. ↑ T. Calligaro; Y. Coquinot; L. Pichon; B. Moignard (2011). "Advances in elemental imaging of rocks using the AGLAE external microbeam". Nuclear Instruments and Methods in Physics Research B. 269 (20): 2364–2372. Bibcode:2011NIMPB.269.2364C. doi:10.1016/j.nimb.2011.02.074.
  6. ↑ Allaby, Ailsa; Allaby, Michael (1999). A Dictionary of Earth Sciences (2nd ed.). Oxford: Oxford University Press. ISBN   0-19-280079-5.
  7. ↑ Same Day Aggregates: Types of Aggregates - Same Day Aggregates Archived 2019-04-06 at the Wayback Machine , accessdate: March 25, 2017
  8. ↑ Indiana Mineral Aggregates Association | Carmel, IN: What are aggregates? - Indiana Mineral Aggregates Association | Carmel, IN, accessdate: March 25, 2017
  9. ↑ Introduction (1): What are Aggregates? « Herefordshire & Worcestershire Earth Heritage Trust: Introduction (1): What are Aggregates? « Herefordshire & Worcestershire Earth Heritage Trust Archived 2019-02-09 at the Wayback Machine , accessdate: March 23, 2017
  10. ↑ Define Aggregate at Dictionary.com: aggregate, accessdate: March 23, 2017
  11. ↑ Qasrawi, Hisham; Marie, Iqbal (2013). "Towards Better Understanding of Concrete Containing Recycled Concrete Aggregate". Advances in Materials Science and Engineering. 2013: 1–8. doi: 10.1155/2013/636034 .


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