Research output: Contribution to journal › Article › peer-review
Somersetite, Pb8O(OH)4(CO3)5, a new complex hydrocerussite-related mineral from the Mendip Hills, England. / Siidra , O.I.; Nekrasova , D.O.; Turner, Rick; Zaitsev, A.N.; Chukanov, N.V.; Polekhovsky, Y.S.; Spratt, John; Rumsey, M.S.
In: Mineralogical Magazine, Vol. 82, No. 5, 10.2018, p. 1211-1224.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Somersetite, Pb8O(OH)4(CO3)5, a new complex hydrocerussite-related mineral from the Mendip Hills, England
AU - Siidra , O.I.
AU - Nekrasova , D.O.
AU - Turner, Rick
AU - Zaitsev, A.N.
AU - Chukanov, N.V.
AU - Polekhovsky, Y.S.
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 -
ID: 36123451