Ichnusaite
A very rare thorium molybdate discovered in 2013 at Su Seinargiu, Sardinia.
Intro adapted from Wikipedia (CC BY-SA).
Ichnusaite is an IMA-recognized mineral species in the molybdate class, with the chemical formula Th(MoO₄)₂·3H₂O.
It crystallizes in the monoclinic crystal system (space group P2_1/c).
Key properties: specific gravity 4.262; White streak; Pearly adamantine luster.
IMA symbol Ich, IMA status: approved, named in 2013.
Found as a secondary mineral in vugs in hydrothermal veins cutting porphyritic granite.
It is found associated with Nuragheite, muscovite, xenotime-(Y), quartz, molybdenite.
The name comes from the old Greek name for Sardinia, Ιχνουσσα, Ichnusa.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data and a Wikipedia introduction — a full written entry hasn’t been published yet.
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