Rumseyite
Turner R W, Siidra O I, Krivovichev S V, Stanley C J, Spratt J
Mineralogical Magazine 76 (2012) 1247-1255
Rumseyite, [Pb2OF]Cl, the first naturally occurring fluoroxychloride
mineral with the parent crystal structure for layered lead oxychlorides
Locality: Merehead quarry, Somerset, England
_database_code_amcsd 0019618
4.065 4.065 12.631 90 90 90 I4/mmm
atom  x  y     z occ Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
Pb    0  0 .1469     .061   .065   .065   .052      0      0      0
OF   .5  0   .25  .5 .049   .049   .049    .05      0      0      0
FO   .5  0   .25  .5 .049   .049   .049    .05      0      0      0
Cl   .5 .5     0     .056   .062   .062   .043      0      0      0