Pb(Al,Si)4O8 Downs R T, Hazen R M, Finger L W American Mineralogist 80 (1995) 937-940 Crystal chemistry of lead aluminosilicate hollandite: A new high-pressure synthetic phase with octahedral Si _database_code_amcsd 0001757 9.414 9.414 2.75 90 90 90 I4 atom x y z occ Biso Pb1 .0435 0 .4146 .466 1.5 Pb2 0 0 .7179 .334 1.5 Si .3510 .1638 0 .6 .61 Al .3510 .1638 0 .4 .61 O1 .1546 .2016 0 .4 O2 .5418 .1641 0 .4