Lusernaite-(Y)
Lusernaite-(Y) is an IMA-recognized mineral species in the carbonate class, with the chemical formula Y₄Al(CO₃)₂(OH,F)₁₁·6H₂O.
It crystallizes in the orthorhombic crystal system (space group Pmna).
Key properties: specific gravity 2.81; White streak; Pearly luster; optically biaxial.
IMA symbol Lus-Y, IMA status: approved, named in 2011.
A late-stage hydrothermal mineral in fractures in regionally metamorphosed gneiss.
It is found associated with Aeschynite-(Y), albite, “chlorite, ” hematite, pyrite, quartz, titanite.
The name refers to the Luserna valley in which the first specimens were collected and a suffix of the chemical symbol of the dominant rare earth element.
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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