AM_Piemontite_18 Formula: Ca1.73 Mn.81 Sr.04 La.02 Ce.02 Pr.002 Nd.01 Al1.88 Mg.01 Fe.51 Si2.97 O13 H Name: Piemontite Unit cell: 8.845 5.668 10.152 90.0 115.35 90.0 , V=459.95 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: BR2H, Locality: Monte Brugiana, Alpi Apuane, Italy