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 | FeS2 |
| Core Elements | Fe |
| Thermal Decomposition | FeS2
540-850°C 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:
4 FeS2(s) + 14 O2(g) + 4 H2O(l) → 4 FeII + 8 SO42 - + 8 H + 4 FeII + O2 + 2 H2 → 4 FeIII + 2 H2O 4 FeIII + 12 H2O → 4 Fe(OH)3 + 12 H +