Iron pyrite: Difference between revisions
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(Created page with "{{Ore |name=Iron pyrite |freq=common |hardness=6-6.5 |density=5 |chemf=FeS2 |m1=Fe |calcprod=Fe2O3 }} pyrite, along with Hematite and Magnetite is a primary ore of i...") |
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pyrite, along with [[Hematite]] and [[Magnetite]] is a primary ore of [[iron]]. | 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) = 4Fe<sup>II</sup> + 8SO4<sup>2-</sup> + 8H<sup>+</sup>}} | |||
{{#Chem: 4Fe<sup>II</sup> + O2 + 4H<sup>+</sup> = 4Fe<sup>III</sup> + 2H2O}} | |||
{{#Chem: 4Fe<sup>III</sup> + 12 H2O = 4Fe(OH)3 + 12H<sup>+</sup>}} | |||
Revision as of 15:20, 30 September 2019
| Frequency | common |
|---|---|
| Hardness | 6-6.5 |
| Density | 5 |
| Chemical Formula | FeS2 |
| Core Elements | Fe |
| Thermal Decomposition | FeS2
°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 + 4 H + → 4 FeIII + 2 H2O 4 FeIII + 12 H2O → 4 Fe(OH)3 + 12 H +