AM_Piemontite_17 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: 8.857 5.671 10.156 90.0 115.29 90.0 , V=461.23 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: BR2P, Locality: Monte Brugiana, Alpi Apuane, Italy