AM_Lalondeite Formula: Na4.6 Ca4.04 Si16 O41 F2 H5.84 Name: Lalondeite Unit cell: 9.589 9.613 12.115 96.62 92.95 119.81 , V=954.82 Space group: P-1 (2)

McDonald A M , Chao G Y , The Canadian Mineralogist , 47 (2009) p.181-191, Lalondeite, a new hydrated Na-Ca fluorosilicate species from Mont Saint-Hilaire,, Quebec: Description and crystal structure, Locality: Poudrette quarry, Mont Saint-Hilaire, Quesbec, Canada