| 11. | Aznalcollar Mines used the liquid to clean pyrites after mining.
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| 12. | Soil may contain iron sulfide as pyrite or calcium sulfate as gypsum.
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| 13. | Pyrite and amorphous iron sulfide along with carbon produce the black coloration.
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| 14. | It commonly contains or is associated with grains of pyrite.
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| 15. | Gold and arsenic occur as a coupled substitution in the pyrite structure.
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| 16. | However, there are limonite pseudomorphs after other minerals such as pyrite.
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| 17. | Other mineral deposits are silver, copper, pyrite, and limestone.
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| 18. | This reaction between iron and sulfides forms pyrite ( FeS 2 ).
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| 19. | Ore minerals include pyrite, chalcopyrite, sphalerite and galena.
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| 20. | Nodular lumps of pyrite and crystals of septarian concretions are also common.
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