Cobalt sulfide
| Identifiers | |
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| 
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| 3D model (JSmol) | 
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| ChemSpider | 
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| EC Number | 
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| PubChem CID | 
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| RTECS number | 
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| UNII | 
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| Properties | |
| CoxSy | |
| Molar mass | 90.9982 g/mol | 
| Appearance | black solid (alpha) grayish-red crystals (beta) | 
| Density | 5.45 g/cm3 | 
| Melting point | 1195 °C | 
| 0.00038 g/100 mL (18 °C) | |
| Solubility | slightly soluble in acid | 
| +225.0·10−6 cm3/mol | |
| Structure | |
| octahedral (beta) | |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references | |
Cobalt sulfide is the name for chemical compounds with a formula CoxSy. Well-characterized species include minerals with the formulas CoS, CoS2, Co3S4, and Co9S8. In general, the sulfides of cobalt are black, semiconducting, insoluble in water, and nonstoichiometric.