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The new mineral species lusernaite-(Y), ideally Y 4 Al(CO 3 ) 2 (OH,F) 11 ·6H 2 O, has been discovered in small fractures of the “Luserna Stone,” a leucocratic orthogneiss belonging to the Dora-Maira massif, Western Alps, Italy. It occurs as colorless, thin platelets, with white streak and mica-like pearly luster, elongated along [100] and flattened on {010}, arranged in radiating aggregates. Lusernaite-(Y) is associated with aeschynite-(Y), albite, “chlorite,” hematite, pyrite, quartz, and titanite. Lusernaite-(Y) has a perfect cleavage on {010} and a less marked one probably on {100}. Its calculated density is 2.810 g/cm3. In plane-polarized light, it is transparent, with parallel extinction and positive elongation. Lusernaite-(Y) is biaxial positive; its optical orientation is a = Z, b = X, c = Y. Owing to the crystal morphology, only two refractive indices could be measured, corresponding to b = 1.566(2) and g = 1.577(2).

Lusernaite-(Y), Y 4 Al(CO 3 ) 2 (OH,F) 11 ·6H 2 O, a new mineral species from Luserna Valley, Piedmont, Italy: Description and crystal structure