| 21. | Other components are chalcopyrite, haematite, ilmenite, magnetite and pyrite.
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| 22. | Pyrite iron sulphide stacked in the dump overheated and ignited.
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| 23. | When pyrite is exposed to moisture and oxygen, sulfuric acid forms.
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| 24. | Greigite is considered an essential precursor of framboidal pyrite formation.
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| 25. | A small pyrite disc was found near the front wall.
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| 26. | These minerals are accompanied by sphalerite, pyrite and chalcopyrite.
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| 27. | The local slate contains pyrites or " fool's gold ".
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| 28. | It occurs in veins containing galena, sphalerite and pyrite.
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| 29. | This bed ranged from to thick and contained iron pyrite as well.
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| 30. | Amphibolite, chlorite, and pyrite are found in a significant portion.
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