Iron pyrite: Difference between revisions
Jump to navigation
Jump to search
No edit summary |
|||
| Line 13: | Line 13: | ||
In contact with a wet natural environment (water, air, perhaps sunlight), pyrite weathers producing ferrous (and perhaps ferric) sulfates: | In contact with a wet natural environment (water, air, perhaps sunlight), pyrite weathers producing ferrous (and perhaps ferric) sulfates: | ||
{{#Chem: 4FeS2(s) + 14O2(g) + 4H2O(l) = 4Fe<sup>II</sup> + 8SO4<sup>2-</sup> + 8H<sup>+</sup>}} | {{#Chem: 4FeS2(s) + 14O2(g) + 4H2O(l) = 4Fe<sup>II</sup> + 8SO4<sup>2-</sup> + 8H<sup>+</sup>}} | ||
{{#Chem: 4Fe<sup>II</sup> + O2 + | {{#Chem: 4Fe<sup>II</sup> + O2 + 2H2 = 4Fe<sup>III</sup> + 2H2O}} | ||
{{#Chem: 4Fe<sup>III</sup> + 12 H2O = 4Fe(OH)3 + 12H<sup>+</sup>}} | {{#Chem: 4Fe<sup>III</sup> + 12 H2O = 4Fe(OH)3 + 12H<sup>+</sup>}} | ||
Latest revision as of 18:32, 2 October 2019
| Frequency | common |
|---|---|
| Hardness | 6-6.5 |
| Density | 5 |
| Chemical Formula | {{#Chem:FeS2}} |
| Core Elements | Fe |
| Thermal Decomposition | {{#Chem:FeS2}}
540-850°C {{#Chem:Fe2O3}} |
pyrite, along with Hematite and Magnetite is a primary ore of iron.
Weathering
In contact with a wet natural environment (water, air, perhaps sunlight), pyrite weathers producing ferrous (and perhaps ferric) sulfates:
{{#Chem: 4FeS2(s) + 14O2(g) + 4H2O(l) = 4FeII + 8SO42- + 8H+}}
{{#Chem: 4FeII + O2 + 2H2 = 4FeIII + 2H2O}}
{{#Chem: 4FeIII + 12 H2O = 4Fe(OH)3 + 12H+}}