AM_Piemontite_16 Formula: Ca1.48 Mn.98 Sr.03 La.16 Ce.04 Pr.02 Nd.06 Sm.003 Th.004 Al1.75 Mg.08 Fe.39 Si3 O13 H Name: Piemontite Unit cell: 8.881 5.683 10.15 90.0 114.99 90.0 , V=464.32 Space group: P121/M1 (11)

Bonazzi P , Garbarino C , Menchetti S , European Journal of Mineralogy , 4 (1992) p.23-33, Crystal chemistry of piemontites: REE-bearing, piemontite from Monte Brugiana, Alpi Apuane, Italy, Sample: BR1C, Locality: Monte Brugiana, Alpi Apuane, Italy