AM_Piemontite_15 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: 8.884 5.685 10.152 90.0 115.0 90.0 , V=464.69 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: BR1A, Locality: Monte Brugiana, Alpi Apuane, Italy