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Sinter terraces in Pamukkale , Turkey

Sinter (from Old High German  sintar 'slag'; in geomorphology also Dauch ) is the substance or rock that is created by a gradual mineral deposit ("sintering"), especially a lime deposit .


Stalactite formation

Sinter is formed by the deposition ( crystallization ) of minerals dissolved in water, i.e. in bodies of water, water pipes and containers or in a humid environment. It forms crust-like coatings

  • in the field - on slopes, steps or terraces ( sinter terrace )
  • and arises in the most varied of forms in caves , mines and moist tunnels as speleothem (cave sinter ) , from sintered skins to mighty banks .

Chemically, it is non-specific to alkali - and / or alkaline earth metal - salts of various inorganic , but also organic acids along with various admixtures. Petrologically , sinter belongs to the sedimentary group . In biology, sinter is called incrustation .

The chemical processes involved in the formation are described in detail under water hardness # lime-carbonic acid balance .

Shapes of the material

Sinter coating in the Eisenberg mine
Recent sinter formation in the Wutach Gorge. The mosses remove carbon dioxide from the water and lime is precipitated.
  • Mineral deposits in nature of relatively pure composition:
  • Mineral characteristics such as quartz veins in other rocks, agate , drusen (geodes)
  • Strictly speaking, salt rocks ( evaporites ) , especially rock salt (halite), are also sinter, but the term is not used here.
  • the concretion , a incurred by precipitation stone, such as bog iron or hollow beads (also warts Inter called)
  • the crusts that form on stone, clay, metallic and other archaeological artifacts that have been in the ground or in the sea for long periods of time
  • Sinter in the true sense of the word is used in technology:
    • the deposits in pots, pipes or hot water boilers ( boiler scale )
    • Urine stone
    • Tartar
    • An iron oxide mixture is also known as sinter , which is produced in the steel industry when hot steel surfaces come into contact with spray water.
  • Sinter, sintered skin or lime sintered skin also refers to the fine crystalline layer a few micrometers thick that is created by evaporation and forms on drying plaster or inorganically bound paint, see also fresco .

Special natural occurrences

Economic use

Since the first half of the 19th century, sintering has been used by the Fontaines pétrifiantes de Saint-Nectaire company in the French town of Saint-Nectaire for the production of objects. For example, reliefs are produced .

See also

Web links

Wiktionary: Sinter  - explanations of meanings, word origins, synonyms, translations

Individual evidence

  1. ^ Radim Kettner : General Geology . Volume 2: Composition of the earth's crust, formation of rocks and deposits . Berlin 1959, p. 98.
  2. ^ Johannes Baier: Karlsbad - city of thermal baths and sinter. Fossils 30, 24-28, 2013.
  3. ^ Johannes Baier: Goethe and the thermal springs of Karlovy Vary (Karlsbad, Czech Republic) . - Jber. Middle Upper Rhine. geol. Ver., NF 94, 87-103, 2012.
  4. Philippe Gloaguen, et al .: Le Routard - Le guide de la visite d'entreprise . No. 79/0425/0 . Hachette Livre, Vanves 2016, ISBN 978-2-01-323703-1 , pp. 236 f .