Supriya Ghosh

Hisingerite

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Category  Silicate mineral
Strunz classification  9.ED.10
Formula (repeating unit)  Fe2Si2O5(OH)4·2H2O
Color  Black, brownish-black
Hisingerite
Crystal system  Monoclinic Unknown space group
Unit cell  a = 5.4, b = 9.03 c = 14.99 [Å]; β = 98.32°; Z = 4

Hisingerite is an iron(III) phyllosilicate mineral with formula Fe3+2Si2O5(OH)4·2H2O. A black or dark brown, lustrous secondary mineral, it is formed by the weathering or hydrothermal alteration of other iron silicate and sulfide minerals.

It was first described in 1828 for an occurrence in Riddarhyttan, Vastmanland, Sweden. It was named after Wilhelm Hisinger (1766–1852), a Swedish chemist.

There are also aluminian hisingerite variety in which one of the iron atoms is replaced by aluminium and chrome-alumina-hisingerite variety in which chromium substitutes for iron.

References

Hisingerite Wikipedia


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