Citation: Bonazzi, P.; Garbarino, C.; Menchetti, S. (1992). Crystal chemistry of piemontites: REE-bearing piemontite from Monte Brugiana, Alpi Apuane, Italy Sample: BR1A. European Journal of Mineralogy, 4, pp. 23-33.
Formula: Al1.75 Ca1.48 Ce0.04 Fe0.39 H La0.16 Mg0.08 Mn0.98 Nd0.06 O13 Pr0.02 Si3 Sm0.003 Sr0.03 Th0.004
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al6 Ca4 Ce2 Fe6 H2 La2 Mg6 Mn8 Nd2 O26 Pr2 Si6 Sm2 Sr2 Th2 (Al3 Ca2 Ce Fe3 H La Mg3 Mn4 Nd O13 Pr Si3 Sm Sr Th)
Multiplicity: 1