Difference between revisions of "Iron pyrite"

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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]].
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==Weathering==
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In contact with a wet natural environment (water, air, perhaps sunlight), pyrite weathers producing ferrous (and perhaps ferric) sulfates:
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{{#Chem: 4FeS2(s) + 14O2(g) + 4H2O(l)  =  4Fe<sup>II</sup> + 8SO4<sup>2-</sup> + 8H<sup>+</sup>}}
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{{#Chem: 4Fe<sup>II</sup> + O2 + 4H<sup>+</sup>  =  4Fe<sup>III</sup> + 2H2O}}
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{{#Chem: 4Fe<sup>III</sup> + 12 H2O  =    4Fe(OH)3 + 12H<sup>+</sup>}}

Revision as of 15:20, 30 September 2019

Iron pyrite 
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 +