Skip to main content Accessibility help
×
Home

Rumseyite, [Pb2OF]Cl, the first naturally occurring fluoroxychloride mineral with the parent crystal structure for layered lead oxychlorides

  • R. W. Turner (a1), O. I. Siidra (a2), S. V. Krivovichev (a2), C. J. Stanley (a3) and J. Spratt (a3)...

Abstract

Rumseyite, ideally [Pb2OF]Cl, is a new mineral species which is associated with calcite, cerussite, diaboleite, hydrocerussite and undifferentiated Mn oxides in a small cavity in 'hydrocerussite' from a manganese pod at Merehead quarry, Somerset, England. Rumseyite is tetragonal, I4/mmm, a = 4.065(1), c = 12.631(7) Å, V = 208.7(1) Å3, Z = 2. The mineral is translucent pale orange-brown with a white streak and vitreous lustre. It is brittle with perfect {100} cleavage; Dcalc = 7.71 g cm–3 (for the ideal formula, [Pb2OF]Cl). The mean refractive index in air at 589 nm is 2.15. The six strongest reflections in the X-ray powder-diffraction pattern [dmeas in Å, (Irel), (hkl)] are as follows: 2.923(100)(013), 2.875(68)(110), 3.848(41)(011), 6.306(17)(002), 1.680(14)(123), 2.110(12)(006). The crystal structure of rumseyite is based on alternating [OFPb2] and Cl layers. Rumseyite is related to other layered Pb oxyhalides. Fluorine and oxygen are statistically disordered over one crystallographic site. Rumseyite is named in honour of Michael Scott (Mike) Rumsey (1980– ), Curator and Collections Manager at the NHM (London), who discovered the mineral. The mineral and name have been approved by the IMA Commission on New Mineral Names and Classification (IMA 2011-091). The holotype specimen is in the collections of the Natural History Museum, London (specimen number BM1970,110).

Copyright

Corresponding author

References

Hide All
Aurivillius, B. (1982) On the crystal structure of a number of non-stoichiometric mixed lead oxide halides composed of PbO like blocks and single halogen layers. Chemica Scripta, 19, 97107.
Aurivillius, B. (1983) On the crystal structure of some non-stoichiometric mixed lead oxide halides and their relation to the minerals ‘‘lorettoite’’ and sundiusite. Chemica Scripta, 22, 511.
Cooper, M.A. and Hawthorne, F.C. (1994) The crystal structure of kombatite, Pb14(VO4)2O9Cl4, a complex heteropolyhedral sheet mineral. American Mineralogist, 79, 550554.
Dickinson, R.G. and Friauf, J.B. (1924) The crystal structure of tetragonal lead monoxide. Journal of the American Chemical Society, 46, 24572462.
Gasperin, M. (1964) Sur la synthese d’un oxychlorure de plomb. Bulletin de la Société française de Minéralogie et de Cristallographie, 87, 278280.
Gillberg, M. (1960) Perite, a new oxyhalide mineral from Långban, Sweden. Arkiv för Mineralogi och Geologi, 2, 565570.
Giuseppetti, G. and Tadini, C. (1973) Riesame della struttura cristallina della nadorite: PbSbO2Cl. Periodico di Mineralogia, 42, 335345.
Kampf, A.R. (1991) Grandreefite, Pb2F2SO4: crystal structure and relationship to the lanthanide oxide sulfates, Ln2O2SO4. American Mineralogist, 76, 278282.
Krivovichev, S.V. and Filatov, S.K. (1999) Metal arrays in structural units based on anion-centered metal tetrahedra. Acta Crystallographica, B55, 664676.
Krivovichev, S.V., Turner, R., Rumsey, M.S., Siidra, O.I. and Kirk, C.A. (2009) The crystal structure and chemistry of mereheadite. Mineralogical Magazine, 73, 103117.
Pasero, M. and Vacchiano, D. Crystal structure of mendipite, Pb3O2Cl2. Neues Jahrbuch für Mineralogie, Monatshefte, 2000, 563569.
Rumsey, M.S. (2008) The first British occurrence of kombatite; Pb14[O9(VO4)2Cl4] from the Wesley Mine near Westbury on Trym, Bristol. Journal of the Russell Society, 11, 5153.
Rumsey, M.S., Krivovichev, S.V., Siidra, O.I., Kirk, C.A., Stanley, C.J. and Spratt, J. (2011) Rickturnerite, Pb7O4[Mg(OH)4](OH)Cl3, a complex new Pb oxychloride mineral. Mineralogical Magazine, 76, 5973.
Siidra, O.I. and Krivovichev, S.V. (2008) Crystal chemistry of oxocentered lead oxyhalides and their importance as perspective materials. Pp. 129141 in: Minerals as Advanced Materials II (S.V. Krivovichev, editor). Springer, Berlin.
Siidra, O.I., Krivovichev, S.V., Filatov, S.K. (2008a) Minerals and synthetic Pb(II) compounds with oxocentered tetrahedra: review and classification. Zeitschrift für Kristallographie, 223, 114125.
Siidra, O.I., Krivovichev, S.V., Turner, R.W. and Rumsey, M. S . (2008b ) Chloro xiphite Pb3CuO2(OH)2Cl2 structure refinement and description in terms of oxocentered OPb4 tetrahedra. Mineralogical Magazine, 72, 793798.
Siidra, O.I., Krivovichev, S.V., Turner, R.W. and Rumsey, M.S. (2011) Natural and synthetic layered Pb(II) oxyhalides. Pp. 319332 in: Minerals as Advanced Materials II (S.V. Krivovichev, editor). Springer, Berlin.
Turner, R.W. (2006) A mechanism for the formation of the mineralized manganese deposits at Merehead Quarr y , Cranmor e , Somer s e t , England. Mineralogical Magazine, 70, 629653.
Turner, R.W. and Rumsey, M.S. (2010) Mineral relationships in the Mendip Hills. Journal of the Russell Society, 13, 347.
Turner, R.W., Siidra, O.I., Rumsey, M.S., Krivovichev, S.V., Stanley, C.S. and Spratt, J. (2012). Hereroite and vladkrivovichevite: two novel lead oxychlorides from the Kombat mine, Namibia. Mineralogical Magazine, 76, 883890.
Welch, M.D., Criddle, A.J. and Symes, R.F. (1998) Mereheadite, Pb2O(OH)Cl: a new litharge-related oxychloride from Merehead Quarry, Cranmore, Somerset. Mineralogical Magazine, 62, 387393.

Keywords

Type Description Title
UNKNOWN
Supplementary materials

Turner et al. supplementary material
CIF

 Unknown (11 KB)
11 KB
UNKNOWN
Supplementary materials

Turner et al. supplementary material
FCF

 Unknown (6 KB)
6 KB

Metrics

Altmetric attention score

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed