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Somersetite, Pb8O(OH)4(CO3)5, a new complex hydrocerussite-related mineral from the Mendip Hills, England

Published online by Cambridge University Press:  15 May 2018

Oleg I. Siidra ,
Diana O. Nekrasova ,
Rick Turner ,
Anatoly N. Zaitsev ,
Nikita V. Chukanov ,
Yury S. Polekhovsky ,
John Spratt  and
Mike S. Rumsey
Oleg I. Siidra*
Affiliation:
Department of Crystallography, St Petersburg State University, University Embankment 7/9, 199034 St Petersburg, Russia Nanomaterials Research Center, Kola Science Center, Russian Academy of Sciences, Apatity, Murmansk Region, 184200, Russia
Diana O. Nekrasova
Affiliation:
Department of Crystallography, St Petersburg State University, University Embankment 7/9, 199034 St Petersburg, Russia
Rick Turner
Affiliation:
The Drey, Allington Track, Allington, Salisbury SP4 0DD, Wiltshire, UK
Anatoly N. Zaitsev
Affiliation:
Department of Mineralogy, St. Petersburg State University, University Embankment 7/9, 199034 St Petersburg, Russia Core Research Laboratories, Imaging and Analysis Centre, Natural History Museum, Cromwell Road, London SW7 5BD, UK
Nikita V. Chukanov
Affiliation:
Institute of Problems of Chemical Physics, Chernogolovka, Moscow region, 142432, Russia
Yury S. Polekhovsky
Affiliation:
Department of Mineral Deposits, Faculty of Geology, St. Petersburg State University, University Embankment 7/9, St. Petersburg 199034, Russia
John Spratt
Affiliation:
Core Research Laboratories, Imaging and Analysis Centre, Natural History Museum, Cromwell Road, London SW7 5BD, UK
Mike S. Rumsey
Affiliation:
Mineral and Planetary Sciences Division, Earth Sciences Department, Natural History Museum, Cromwell Road, London SW7 5BD, UK
*
*E-mail: o.siidra@spbu.ru
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Abstract

The new mineral somersetite, has been found at Torr Works (‘Merehead quarry’) in Somerset, England, United Kingdom. Somersetite is green or white (typically it is similar visually to hydrocerussite-like minerals but with a mint-green tint), forms plates and subhedral grains up to 5 mm across and up to 2 mm thick. In bi-coloured crystals it forms very thin intergrowths with plumbonacrite. The empirical formula of somersetite is Pb8.00C5.00H4.00O20. The simplified formula is Pb8O(OH)4(CO3)5, which requires: PbO = 87.46, CO2 = 10.78, H2O = 1.76, total 100.00 wt.%.

The infrared spectrum of somersetite is similar to that of plumbonacrite and, to a lesser degree, hydrocerussite. Somersetite is hexagonal, P63/mmc, a = 5.2427(7), c = 40.624(6) Å, V = 967.0(3) Å3 and Z = 2. The eight strongest reflections of the powder X-ray diffraction (XRD) pattern [d,Å(I)(hkl)] are: 4.308(33)(103), 4.148(25)(104), 3.581(40)(107), 3.390(100)(108), 3.206(55)(109), 2.625(78)(110), 2.544(98)(0.0.16) and 2.119(27)(1.0.17). The crystal structure was solved from single-crystal XRD data giving R1 = 0.031. The structure of somersetite is unique and consists of the alternation of the electroneutral plumbonacrite-type [Pb5O(OH)2(CO3)3]0 and hydrocerussite-type [Pb3(OH)2(CO3)2]0 blocks separated by stereochemically active lone electron pairs on Pb2+. There are two blocks of each type per unit cell in the structure, which corresponds to the formula [Pb5O(OH)2(CO3)3][Pb3(OH)2(CO3)2] or Pb8O(OH)4(CO3)5 in a simplified representation. The 2D blocks are held together by weak Pb–O bonds and weak interactions between lone pairs.

Keywords

somersetitehydrocerussiteplumbonacritenew mineralleadcarbonatelayered structureMerehead quarryTorr workslone electron pair
Type
Article
Information
Mineralogical Magazine , Volume 82 , Issue 5 , October 2018 , pp. 1211 - 1224
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

Associate Editor: Juraj Majzlan

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