Boltwoodite Stohl F V, Smith D K American Mineralogist 66 (1981) 610-625 The crystal chemistry of the uranyl silicate minerals Locality: New Method mine, Amboy, California, USA _database_code_amcsd 0000838 7.073 7.064 6.638 90 105.75 90 P2_1 atom x y z Biso U .0252 .25 .13851 0.9 K .541 .548 .153 4.4 Si .933 .25 .637 0.9 O1 .290 .25 .147 0.6 O2 .227 .75 .885 3.9 O3 .022 -.079 .194 4.7 O4 -.022 .079 -.194 4.7 O5 .060 .25 .484 0.9 O6 .294 .75 .490 3.7 Wat .400 .413 .689 2.3