Grandaite Camara F, Ciriotti M E, Bittarello E, Nestola F, Massimi F, Radica F, Costa E, Benna P, Piccoli G C Mineralogical Magazine 78 (2014) 757-774 Arsenic-bearing new mineral species from Valletta mine, Maira Valley, Piedmont, Italy: I. Grandaite, Sr2Al(AsO4)2(OH), description and crystal structure Locality: Valletta mine, Maira Valley, Piedmont, Italy _database_code_amcsd 0020474 7.5764 5.9507 8.8050 90 112.551 90 P2_1/m atom x y z occ Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) SrA1 .25931 .25 .73723 .548 .01875 .0179 .0206 .0226 0 .01310 0 CaA2 .25931 .25 .73723 .452 .01875 .0179 .0206 .0226 0 .01310 0 SrA2 .67546 .25 .58860 .921 .01325 .01466 .01477 .01246 0 .00758 0 BaA2 .67546 .25 .58860 .079 .01325 .01466 .01477 .01246 0 .00758 0 AlM 0 0 0 .68 .0106 .0139 .0087 .0090 -.0004 .0039 .0000 MgM 0 0 0 .13 .0106 .0139 .0087 .0090 -.0004 .0039 .0000 Fe3+M 0 0 0 .14 .0106 .0139 .0087 .0090 -.0004 .0039 .0000 Mn3+M 0 0 0 .12 .0106 .0139 .0087 .0090 -.0004 .0039 .0000 AsT1 .43733 .25 .17111 .886 .01236 .01242 .01138 .01137 0 .00242 0 VT1 .43733 .25 .17111 .114 .01236 .01242 .01138 .01137 0 .00242 0 AsT2 .03113 .25 .33393 .884 .01032 .01242 .01054 .00925 0 .00556 0 VT2 .03113 .25 .33393 .116 .01032 .01242 .01054 .00925 0 .00556 0 O1 .0231 .5144 .7853 .0203 .0330 .0132 .0156 .0025 .0105 .0020 O2 .2635 .25 .4501 .0265 .0152 .0399 .0217 0 .0041 0 O3 .9109 .25 .4550 .0320 .0334 .0410 .0345 0 .0273 0 O4 .5055 .0223 .2905 .0197 .0226 .0153 .0177 .0017 .0039 .0026 O5 .5209 .25 .0207 .0391 .0413 .059 .0276 0 .0249 0 O6 .1923 .25 .0638 .0210 .0149 .0216 .0207 0 .0005 0 O7 .8303 .25 .9207 .0137 .0121 .0150 .0124 0 .0029 0 H7 .7043 .25 .9230 .0200