Bultfonteinite Biagioni C, Bonaccorsi E, Merlino S Atti della Societa Toscana di Scienze Naturali, Memorie, Serie A 115 (2010) 9-15 Crystal structure of bultfonteinite, Ca4[SiO3(OH)]2F2*2H2O, from N'chwaning II mine (Kalahari Manganese Field, Republic of South Africa) Locality: N'chwaning II mine, South Africa _database_code_amcsd 0018795 10.999 8.176 5.6678 94.24 89.00 90.18 P-1 atom x y z occ Uiso Ca1 .1326 .7934 .7841 .0108 Ca2 .3686 .7940 .2849 .0107 Ca3 .1195 .4778 .2492 .0105 Ca4 .3820 .4804 .7467 .0105 Si1 .4280 .2392 .2142 .0091 Si2 .0701 .2393 .7278 .0089 F1 .2513 .6226 .0130 .0122 F2 .2490 .6230 .5118 .0113 O3 .0438 .0413 .6971 .5 .0132 OH3 .0438 .0413 .6971 .5 .0132 O4 .4563 .0400 .1965 .5 .0152 OH4 .4563 .0400 .1965 .5 .0152 O5 .2810 .2685 .1897 .5 .0133 OH5 .2810 .2685 .1897 .5 .0133 O6 .2172 .2688 .7540 .5 .0119 OH6 .2172 .2688 .7540 .5 .0119 O7 .0101 .3214 .5005 .0120 O8 .0069 .3184 .9647 .0112 Wat9 .1908 .9587 .1603 .0196 Wat10 .3102 .9564 .6566 .0205 O11 .5066 .6809 .0034 .0094 O12 .4867 .3208 .4580 .0112