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

Олег Иоханнесович Сийдра, Диана Олеговна Некрасова, Rick Turner, Анатолий Николаевич Зайцев, Н.В. Чуканов, Юрий Степанович Полеховский, John Spratt, M.S. Rumsey

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Abstract

The new mineral somersetite, has been found at Ton 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 plunbonacrite and, to a lesser degree, bydrocerussite. Somersetite is hexagonal, P6(3)/mmc, a = 5.2427(7), c = 40.624(6) , V = 967.0(3) (3) and Z = 2. The eight strongest reflections of the powder X-ray diffraction (XRD) pattern [d,(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 R-1 = 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 [Pb-3(OH)(2)(CO3)(2)](0) blocks separated by stereochemically active lone electron pairs on Pb-2(+). There are two blocks of each type per unit cell in the structure, which corresponds to the formula [Pb5O(OH)(2)(CO3)(3)][Pb-3(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.

Original languageEnglish
Pages (from-to)1211-1224
Number of pages14
JournalMineralogical Magazine
Volume82
Issue number5
DOIs
Publication statusPublished - Oct 2018

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@article{ad8722f3dd7847c4a33b7f4b910dc5e4,
title = "Somersetite, Pb8O(OH)4(CO3)5, a new complex hydrocerussite-related mineral from the Mendip Hills, England",
abstract = "The new mineral somersetite, has been found at Ton 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 plunbonacrite and, to a lesser degree, bydrocerussite. Somersetite is hexagonal, P6(3)/mmc, a = 5.2427(7), c = 40.624(6) , V = 967.0(3) (3) and Z = 2. The eight strongest reflections of the powder X-ray diffraction (XRD) pattern [d,(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 R-1 = 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 [Pb-3(OH)(2)(CO3)(2)](0) blocks separated by stereochemically active lone electron pairs on Pb-2(+). There are two blocks of each type per unit cell in the structure, which corresponds to the formula [Pb5O(OH)(2)(CO3)(3)][Pb-3(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 = "somersetite, hydrocerussite, plumbonacrite, new mineral, lead, carbonate, layered structure, Merehekul quarry, Torr works, lone electron pair, CRYSTAL-STRUCTURE, MEREHEAD QUARRY, PB4SO4(CO3)(2)(OH)(2), MACPHERSONITE, OXYCHLORIDE, CHEMISTRY",
author = "Сийдра, {Олег Иоханнесович} and Некрасова, {Диана Олеговна} and Rick Turner and Зайцев, {Анатолий Николаевич} and Н.В. Чуканов and Полеховский, {Юрий Степанович} and John Spratt and M.S. Rumsey",
year = "2018",
month = "10",
doi = "10.1180/minmag.2017.081.087",
language = "English",
volume = "82",
pages = "1211--1224",
journal = "Mineralogical Magazine",
issn = "0026-461X",
publisher = "Mineralogical Society",
number = "5",

}

TY - JOUR

T1 - Somersetite, Pb8O(OH)4(CO3)5, a new complex hydrocerussite-related mineral from the Mendip Hills, England

AU - Сийдра, Олег Иоханнесович

AU - Некрасова, Диана Олеговна

AU - Turner, Rick

AU - Зайцев, Анатолий Николаевич

AU - Чуканов, Н.В.

AU - Полеховский, Юрий Степанович

AU - Spratt, John

AU - Rumsey, M.S.

PY - 2018/10

Y1 - 2018/10

N2 - The new mineral somersetite, has been found at Ton 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 plunbonacrite and, to a lesser degree, bydrocerussite. Somersetite is hexagonal, P6(3)/mmc, a = 5.2427(7), c = 40.624(6) , V = 967.0(3) (3) and Z = 2. The eight strongest reflections of the powder X-ray diffraction (XRD) pattern [d,(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 R-1 = 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 [Pb-3(OH)(2)(CO3)(2)](0) blocks separated by stereochemically active lone electron pairs on Pb-2(+). There are two blocks of each type per unit cell in the structure, which corresponds to the formula [Pb5O(OH)(2)(CO3)(3)][Pb-3(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.

AB - The new mineral somersetite, has been found at Ton 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 plunbonacrite and, to a lesser degree, bydrocerussite. Somersetite is hexagonal, P6(3)/mmc, a = 5.2427(7), c = 40.624(6) , V = 967.0(3) (3) and Z = 2. The eight strongest reflections of the powder X-ray diffraction (XRD) pattern [d,(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 R-1 = 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 [Pb-3(OH)(2)(CO3)(2)](0) blocks separated by stereochemically active lone electron pairs on Pb-2(+). There are two blocks of each type per unit cell in the structure, which corresponds to the formula [Pb5O(OH)(2)(CO3)(3)][Pb-3(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.

KW - somersetite

KW - hydrocerussite

KW - plumbonacrite

KW - new mineral

KW - lead

KW - carbonate

KW - layered structure

KW - Merehekul quarry

KW - Torr works

KW - lone electron pair

KW - CRYSTAL-STRUCTURE

KW - MEREHEAD QUARRY

KW - PB4SO4(CO3)(2)(OH)(2)

KW - MACPHERSONITE

KW - OXYCHLORIDE

KW - CHEMISTRY

UR - https://www.cambridge.org/core/product/identifier/S0026461X18000956/type/journal_article

UR - http://www.mendeley.com/research/somersetite-pb8ooh4co35-new-complex-hydrocerussiterelated-mineral-mendip-hills

U2 - 10.1180/minmag.2017.081.087

DO - 10.1180/minmag.2017.081.087

M3 - Article

VL - 82

SP - 1211

EP - 1224

JO - Mineralogical Magazine

JF - Mineralogical Magazine

SN - 0026-461X

IS - 5

ER -