Trimounsite-(Y)
Trimounsite-(Y) is an IMA-recognized mineral species in the silicate class, with the chemical formula Y₂Ti₂SiO₉.
It crystallizes in the monoclinic crystal system (space group P2_1/c).
Key properties: Mohs hardness 7; specific gravity 5; White streak; Adamantine luster; optically biaxial.
IMA symbol Tmo-Y, IMA status: approved, named in 1989.
Found in dolomitic portions of a talc deposit.
It is found associated with Allanite, bastnÄa site, monazite, parisite, synchysite, calcite, dolomite.
The name is derived from the locality, the Trimouns talc deposit, France, and its yttrium content.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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