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Yeomanite, Pb2O(OH)Cl, a new chain-structured Pb oxychloride from Merehead Quarry, Somerset, England

Published online by Cambridge University Press:  02 January 2018

R. W. Turner ,
O. I. Siidra ,
M. S. Rumsey ,
Y. S. Polekhovsky ,
Y. L. Kretser ,
S. V. Krivovichev ,
J. Spratt  and
C. J. Stanley
R. W. Turner*
Affiliation:
The Drey, Allington Track, Allington, Salisbury SP4 0DD, Wiltshire, UK
O. I. Siidra
Affiliation:
Department of Crystallography, Geological Faculty, St Petersburg State University, University Embankment 7/9, St Petersburg 199034, Russia
M. S. Rumsey
Affiliation:
Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, UK
Y. S. Polekhovsky
Affiliation:
Department of Mineral Deposits, St Petersburg State University, University Embankment 7/9, 199034 St Petersburg, Russia
Y. L. Kretser
Affiliation:
V. G. Khlopin Radium Institute, Roentgen Street 1, 197101 St Petersburg, Russia
S. V. Krivovichev
Affiliation:
Department of Crystallography, Geological Faculty, St Petersburg State University, University Embankment 7/9, St Petersburg 199034, Russia
J. Spratt
Affiliation:
Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, UK
C. J. Stanley
Affiliation:
Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, UK
*
*E-mail: [email protected]
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Abstract

Yeomanite, Pb2O(OH)Cl, is a new Pb-oxychloride found in the manganese pod mineral assemblage at Merehead (Torr Works) Quarry, near Cranmore, Somerset, England. Yeomanite is named in joint recognition of Mrs Angela Yeoman (1931–) and her company, Foster Yeoman, who operated Merehead Quarry for aggregate until 2006. The mineral is normally white, occasionally grey, with a white streak and a vitreous to transparent lustre. Invariably intimately associated with mendipite, yeomanite appears to be formed of small, twisted, rope-like fibres growing from the end of columnar mendipite masses, forming loose mats and strands resembling asbestos. Individual fibres are generally <8 mm long, but exceptionally may reach up to 15 mm. There is a perfect cleavage parallel to the long axis of the fibres but this is masked by the fibrous nature, especially as individual fibres break easily. The Dcalc for the ideal formula is 7.303 g/cm3. The mean RI in air at 589 nm is 2.27. The eight strongest reflections in the powder X-ray diffraction pattern [(d in Å) (Intensity) (hkl)] are: 2.880(100)(113); 2.802(78)(006); 3.293(61)(200); 3.770(32)(011); 2.166(22)(206); 1.662(19)(119); 2.050(18)(303); 3.054(17)(105) Yeomanite is orthorhombic, Pnma, a = 6.585(10), b = 3.855(6), c = 17.26(1) Å, V = 438(1) Å3, Z = 4. Yeomanite is a new example of the growing family of lead oxychloride minerals that have a structure based upon oxocentred OPb4 tetrahedra, which, in this mineral, jointly with OHPb3 triangles, form [O(OH)Pb2]+ chains similar to those observed in synthetic Pb2O(OH)I. Yeomanite is structurally related to sidpietersite, penfieldite and laurionite.

Keywords

yeomanitenew mineralPb oxyhalideoxocentred unitscrystal structureMerehead quarry
Type
Research Article
Information
Mineralogical Magazine , Volume 79 , Issue 5 , October 2015 , pp. 1203 - 1211
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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