Mikasaite, a mixed iron-aluminium sulfate of chemical formula (Fe³⁺, Al³⁺)₂(SO₄)₃ is the name of mineralogical form of iron(III) sulfate.
This anhydrous form occurs very rarely and is connected with coal fires.
The hydrates are more common, with coquimbite (nonahydrate) as probably the most often met among them.
Paracoquimbite is the other, rarely met natural nonahydrate.
Kornelite (heptahydrate) and quenstedtite (decahydrate) are rarely found.
Lausenite (hexa- or pentahydrate) is a doubtful species.
All the mentioned natural hydrates are unstable compounds connected with Fe-bearing primary minerals (mainly pyrite and marcasite) oxidation in ore beds.
In the solutions of the ore beds oxidation zones the iron(III) sulfate is also an important oxidative agent.
Mikasaite, a mixed iron-aluminium sulfate of chemical formula (Fe³⁺, Al³⁺)₂(SO₄)₃ is the name of mineralogical form of iron(III) sulfate. This anhydrous form occurs very rarely and is connected with coal fires. The hydrates are more common, with coquimbite (nonahydrate) as probably the most often met among them. Paracoquimbite is the other, rarely met natural nonahydrate. Kornelite (heptahydrate) and quenstedtite (decahydrate) are rarely found. Lausenite (hexa- or pentahydrate) is a doubtful species. All the mentioned natural hydrates are unstable compounds connected with Fe-bearing primary minerals (mainly pyrite and marcasite) oxidation in ore beds. In the solutions of the ore beds oxidation zones the iron(III) sulfate is also an important oxidative agent.
Iron(III) sulfate