Ichnusaite
A variety of Minerals
What is Ichnusaite?
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.
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Key Characteristics
Formation of Ichnusaite
Muscovite, nuragheite, and xenotime-(Y) are the associates of ichnusaite.
Composition of Ichnusaite
The main features of the crystal structure of ichnusaite are: 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
Quick Facts
Physical Properties
- Color
- Colorless
- Density
- 4.262 g/cm³
- Streak
- white
Chemical Properties
- Chemical Formula
- Th(MoO4)2·3H2O
- Elements
- H, Mo, O, Th

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