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However, some of the concrete surfaces which are today painted were originally unpainted as they suffered early on from staining and streaking from iron pyrites in the aggregate.
en.wikipedia.org Striking flint against an iron-containing rock, such as pyrites, will make sparks fly!
montrealgazette.com This caused many to note that the foundation would be in danger of cracking and heaving once the pyrites swelled with moisture.
en.wikipedia.org When the water is however allowed to seep into mines it is oxidised and polluted by the exposed iron pyrites.
en.wikipedia.org It contains a thin irregular layer of sandstone rich in the mineral iron pyrites (fool's gold) and pieces of a bone bed containing bone and teeth of fish and reptiles.
en.wikipedia.org 互联网提供的例句（未经PONS编辑处理）
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www.bayceer.uni-bayreuth.de However, pure chemical reaction between nitrate and pyrite could not take place neither experimentally in the natural sediment nor be detected in marine system.
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Allerdings könnte rein chemische Reaktion zwischen Nitrat und Pyrit weder experimentell in dem natürlichen Sediment noch in marinem System stattfinden.
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www.bayceer.uni-bayreuth.de Since Fe(III) is detected as a well-known oxidant for pyrite even at neutral pH, Fe(III) is assumed to be an effective oxidant for pyrite in the presence of nitrate.
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Weil Fe(III) ein bekanntes Oxidationsmittel für Pyrit auch unter neutralen Bedingungen ist, wird angenommen, dass Fe(III) in Anwesenheit von Nitrat als ein wirksames Oxidationsmittel von Pyrit funktioniert.
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www.biologie.uni-regensburg.de Prof. Dr. Wulf Depmeier) , this project aims to investigate the influence of the orientation of the pyrite on the microbial oxidation of pyrite by various mesophilic Bacteria and thermophilic Archaea.
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Prof. Dr. Wulf Depmeier) wird in diesem Projekt die Orientierungsabhängigkeit der mikrobiellen Oxidation von Pyrit durch unterschiedliche mesophile Bakterien und thermophile Archaeen untersucht.
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www.geosammlung.uni-bremen.de Carbon, as graphite, and chlorite minerals as well as pyrite are believed to be responsible for these discolourations that can be observed in the floor cover of San Pietro for example.
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Neben Kohlenstoff in Form von Graphit sollen Chlorit-Minerale und Pyrit für solche Verfärbungen verantwortlich sein. Diese Verfärbungen sind zum Beispiel im Bodenbelag des Petersdoms erkennbar.
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www.showcaves.com The gold ore is gold bearing pyrite ( FeS2 ) with a gold content of 400g to 1kg gold per ton ore.
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Das Golderz ist goldhaltiger Pyrit ( Schwefelkies ) mit einem Goldgehalt von 400g bis 1kg pro Tonne Erz.
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