title: Nuragheite
text: # Nuragheite
  
  Nuragheite is a rare natural thorium molybdate, formula $Th(MoO_4)_2·H_2O,$ discovered in Su Seinargiu, Sarroch, Cagliari, Sardegna, Italy. This locality is also a place of discovery of the other thorium molybdate - ichnusaite, which is a trihydrate.
  
  ## Occurrence and association
  
  Nuragheite is a part of molybdenum-bismuth mineralization. It coexists with ichnusaite, muscovite, and xenotime-(Y).
  
  ## Notes on chemistry
  
  Nuragheite is chemically pure.
  
  ## Crystal structure
  
  The crystal structure of nuragheite is composed of (100) layers with $^{IX}Th-centered$ polyhedra and Mo-centered tetrahedra. It is thus similar to that of ichnusaite.
  
  