Rahul Sharma (Editor)

Pickeringite

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Category
  
Sulfate mineral

Strunz classification
  
7.CB.85

Space group
  
P21/c

Formula(repeating unit)
  
MgAl2(SO4)4·22(H2O)

Crystal system
  
Monoclinic

Pickeringite

Crystal class
  
Prismatic (2/m)(same H-M symbol)

Pickeringite is a magnesium aluminium sulfate mineral with formula MgAl2(SO4)4·22(H2O). It forms a series with halotrichite.

It forms as an alteration product of pyrite in aluminium rich rocks and in coal seams. It also occurs in pyrite rich hydrothermal ore deposits in arid regions. It forms in fumaroles and in caves. It occurs with kalinite, alunogen, epsomite, melanterite, copiapite and gypsum.

It was first described in 1844 for an occurrence in Cerros Pintados, Pampa del Tamarugal, Iquique Province, Tarapacá Region, Chile. It was named for American linguist and philologist John Pickering (1777–1846).

References

Pickeringite Wikipedia


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