| 21. | Supergene ores rich in sulfides may be concentrated using froth flotation.
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| 22. | Silver tarnishes to form a thin surface layer of silver sulfide.
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| 23. | Similarly some reporters have noted an unsafe level of hydrogen sulfide.
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| 24. | Glaucodot is classed as a sulfide in the arsenopyrite l�llingite group.
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| 25. | This yellow solid is one of two commercially produced phosphorus sulfides.
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| 26. | This can begin when the sulfide is exposed to the atmosphere.
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| 27. | Hydrogen sulfide ( ) is produced as a metabolic end product.
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| 28. | How many sulfide anions are in a unit cell of ZnS?
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| 29. | Chemicals that contribute to the odor include methylmercaptan and hydrogen sulfide.
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| 30. | The gossan deposit overlies a pyrrhotite deposit of iron sulfide ore.
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