Trisha Shetty (Editor)

Ichnusaite

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Category
  
Molybdate minerals

Crystal system
  
Monoclinic

Formula(repeating unit)
  
Th(MoO4)2•3H2O

Space group
  
P21/b

Ichnusaite World39s rarest minerals for some total supply less than sugar cube

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

Unit cell
  
a = 9.68, b = 10.38c = 9.38 [Å], β = 90.00° (approximated)Z = 4

Ichnusaite is a very rarely found mineral. Ichnusaite is a natural compound of thorium and molybdenum with the formula Th(MoO4)2·3H2O. It was discovered in Su Seinargiu, Sarroch, Cagliari, Sardegna, Italy in 2013.
This locality is also a place of discovery of the second natural thorium molybdate - nuragheite.

Contents

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Occurrence and association

Muscovite, nuragheite, and xenotime-(Y) are the associates of ichnusaite.

Crystal structure

The main features of the crystal structure of ichnusaite are:

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  • electroneutral Th(MoO4)2(H2O)2 (100) sheets
  • ThO7(H2O)2 and MoO4 polyhedra polymerize to give the above sheets
  • sheets are stacked along [100] and held by hydrogen bonds

    • Ichnusaite httpswwweurekalertorgmultimediapubweb1084

    References

    Ichnusaite Wikipedia
    (Text) CC BY-SA