data_global _chemical_name_mineral 'Bearthite' loop_ _publ_author_name 'Chopin C' 'Brunet F' 'Gebert W' 'Medenbach O' 'Tillmanns E' _journal_name_full 'Schweizerische Mineralogische und Petrographische Mitteilungen' _journal_volume 73 _journal_year 1993 _journal_page_first 1 _journal_page_last 9 _publ_section_title ; Bearthite, Ca2Al[PO4]2(OH), a new mineral from high-pressure terranes of the western Alps ; _database_code_amcsd 0015407 _chemical_compound_source 'Dora Maira massif, western Alps, Italy' _chemical_formula_sum 'Ca2 Al P2 O9 H' _cell_length_a 7.231 _cell_length_b 5.734 _cell_length_c 8.263 _cell_angle_alpha 90 _cell_angle_beta 112.57 _cell_angle_gamma 90 _cell_volume 316.365 _exptl_crystal_density_diffrn 3.297 _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_U_iso_or_equiv Cal 0.22930 0.75000 0.25390 0.01900 Ca2 0.82800 0.75000 0.41750 0.01600 Al 0.50000 0.50000 0.00000 0.01600 P1 0.93730 0.25000 0.17300 0.01500 P2 0.52490 0.25000 0.33910 0.01600 O1 0.52510 0.52770 0.78080 0.01900 O2 0.74520 0.25000 0.45190 0.02400 O3 0.40030 0.25000 0.44950 0.02400 O4 0.99290 0.03140 0.28940 0.01900 O5 0.02840 0.25000 0.03560 0.02300 O6 0.70010 0.25000 0.06420 0.01700 O-H 0.32690 0.25000 0.91380 0.01700