data_global _chemical_name_mineral 'Piemontite' loop_ _publ_author_name 'Bonazzi P' 'Garbarino C' 'Menchetti S' _journal_name_full 'European Journal of Mineralogy' _journal_volume 4 _journal_year 1992 _journal_page_first 23 _journal_page_last 33 _publ_section_title ; Crystal chemistry of piemontites: REE-bearing piemontite from Monte Brugiana, Alpi Apuane, Italy Sample: BR2P ; _database_code_amcsd 0006436 _chemical_compound_source 'Monte Brugiana, Alpi Apuane, Italy' _chemical_formula_sum 'Ca1.73 Mn.81 Sr.04 La.02 Ce.02 Pr.002 Nd.01 Al1.88 Mg.01 Fe.51 Si2.97 O13 H' _cell_length_a 8.857 _cell_length_b 5.671 _cell_length_c 10.156 _cell_angle_alpha 90 _cell_angle_beta 115.29 _cell_angle_gamma 90 _cell_volume 461.225 _exptl_crystal_density_diffrn 3.575 _symmetry_space_group_name_H-M 'P 1 21/m 1' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2-y,z' '-x,1/2+y,-z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy _atom_site_U_iso_or_equiv CaA1 0.75520 0.75000 0.15100 0.86500 0.00690 MnA1 0.75520 0.75000 0.15100 0.20250 0.00690 CaA2 0.59820 0.75000 0.42580 0.86500 0.01170 SrA2 0.59820 0.75000 0.42580 0.04000 0.01170 LaA2 0.59820 0.75000 0.42580 0.02000 0.01170 CeA2 0.59820 0.75000 0.42580 0.02000 0.01170 PrA2 0.59820 0.75000 0.42580 0.00200 0.01170 NdA2 0.59820 0.75000 0.42580 0.01000 0.01170 AlM1 0.00000 0.00000 0.00000 0.62660 0.00550 MgM1 0.00000 0.00000 0.00000 0.00330 0.00550 MnM1 0.00000 0.00000 0.00000 0.20250 0.00550 FeM1 0.00000 0.00000 0.00000 0.17000 0.00550 AlM2 0.00000 0.00000 0.50000 0.62660 0.00550 MgM2 0.00000 0.00000 0.50000 0.00330 0.00550 MnM2 0.00000 0.00000 0.50000 0.20250 0.00550 FeM2 0.00000 0.00000 0.50000 0.17000 0.00550 AlM3 0.29800 0.25000 0.22220 0.62660 0.00710 MgM3 0.29800 0.25000 0.22220 0.00330 0.00710 MnM3 0.29800 0.25000 0.22220 0.20250 0.00710 FeM3 0.29800 0.25000 0.22220 0.17000 0.00710 Si1 0.34210 0.75000 0.04590 0.99000 0.00480 Si2 0.68600 0.25000 0.27340 0.99000 0.00500 Si3 0.18620 0.75000 0.32030 0.99000 0.00480 O1 0.23500 0.99210 0.03650 1.00000 0.00850 O2 0.30700 0.97920 0.35620 1.00000 0.00820 O3 0.79920 0.01550 0.33410 1.00000 0.00960 O4 0.05810 0.25000 0.13110 1.00000 0.00380 O5 0.04300 0.75000 0.14780 1.00000 0.00770 O6 0.07280 0.75000 0.41270 1.00000 0.00620 O7 0.51610 0.75000 0.18240 1.00000 0.00940 O8 0.53290 0.25000 0.31590 1.00000 0.01370 O9 0.61690 0.25000 0.09530 1.00000 0.01410 O10 0.08900 0.25000 0.43490 1.00000 0.00530 H 0.08100 0.25000 0.33000 1.00000 0.02000