ichnusaite

{{Infobox mineral | name = Ichnusaite | boxwidth = | boxbgcolor = | image = | imagesize = | alt = | caption = | category = Molybdate minerals | formula = Th(MoO4)2•3H2O | IMAsymbol = Ich | molweight = | strunz = | system = Monoclinic | class = Prismatic (2/m) (same H-M symbol) | symmetry = P21/b | unit cell = a = 9.68, b = 10.38c = 9.38 [Å], β = 90.00° (approximated) Z = 4 | color = Colorless | colour = | habit = | twinning = | cleavage = {100}, perfect | fracture = | tenacity = Brittle | mohs = | luster = Pearly adamantine | streak = | diaphaneity = | gravity = | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = 25px Radioactive | prop1 = | prop1text = | references = }} Ichnusaite (pronounced iknusa-ait) 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. The name is from the old Greek name of Sardinia, Ιχνουσσα, Ichnusa. This locality is also a place of discovery of the second natural thorium molybdate - nuragheite.

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