The crystal structure of philolithite, a trellis-like open framework based on cubic closest-packing of anions

Moore, Paulus B.; Kampf, Anthony R.; Gupta, P. K. Sen

doi:10.2138/am-2000-5-623

Cited by 24 publications

(6 citation statements)

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“…Extensive studies of Pb mineral assemblages from oxidation zones of polymetallic mineral deposits revealed a group of Pb oxysalt minerals consisting of different units of polymerized (OPb 4 ) tetrahedra, − which prompted both experimental and theoretical works. − ,− …”

Section: Introductionmentioning

confidence: 99%

Anion-Centered Tetrahedra in Inorganic Compounds

et al. 2013

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Section: Introductionmentioning

confidence: 99%

Anion-Centered Tetrahedra in Inorganic Compounds

et al. 2013

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“…4f). The [O 2 Pb] 2+ chains are topologically identical to those which occur in the structures of philolithite Pb 12 O 6 Mn(Mg,Mn) 2 (Mn,Mg) 4 (SO 4 ) (CO 3 ) 4 Cl 4 (OH) 12 (Moore et al 2000), lanarkite [Pb 2 O] (SO 4 ) (Sahl 1970), phoenicochroite [Pb 2 O](CrO 4 ) (Williams et al 1970), and synthetic analogues (Mentzen et al 1984;Bosselet et al 1985). In [Pb 2 O](SeO 4 ), these [O 2 Pb] chains are connected by SeO 4 tetrahedra.…”

Section: [Pb 2 O](seo 4 )-The Product Of [Pb 2 F 2 ](Seo 4 ) Hydrolysismentioning

confidence: 72%

[Pb2F2](SeO4): a heavier analogue of grandreefite, the first layered fluoride selenate

et al. 2017

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This relatively low-temperature process involves complete rearrangement of the crystal structure-from a 2D architecture featuring slabs [Pb 2 F 2 ] 2+ formed by fluorine-centered tetrahedra into a structure characterized by 1D motifs based on [OPb 2 ] 2+ chains of oxocentered tetrahedra. The comparative crystal chemistry of the obtained anion-centered structural architectures is discussed. (Siidra et al. 2013c(Siidra et al. , 2015. Most of these structures can be notionally decomposed into tetragonal subcells with an a parameter similar to that of litharge (commonly 3.75-4.35 Å, depending on the layer composition), while c can vary over a wide range (from 5 to more than 75 Å) as might be expected for layered structures (Charkin 2008). Within these "archetypic" subcells, the 2 ∞ [XM] (X = anion, M = cation) slabs contain two X and two M atoms; they are positively charged and interleave with various anionic species. The OM 4 oxocentered tetrahedra, with M = Pb 2+ , Bi 3+ or rare-earth elements, are the most common contributors to these slabs. Second rank the FM 4 fluoride-centered tetrahedra with M being rare-earth or alkaline-earth elements, but most commonly Pb 2+ . [Pb 2 F 2 ] 2+ slabs have been found in the structures of the minerals matlockite [Pb 2 F 2 ](Cl) 2 (c = 9 Å) (Pasero and Perchiazzi 1996), grandreefite [Pb 2 F 2 ](SO 4 ) (c = 14 Å)

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“…Vladkrivovichevite is structurally unique in the Pb oxyhalides as it contains oxocentred OPb 4 Mn 2 octahedra. It can be considered to be related c o m p o s i t i o n a l l y t o c h l o r o x i p h i t e , Pb 3 CuO 2 (OH) 2 Cl 2 (Spencer and Mountain, 1923;Finney et al, 1977;Siidra et al, 2008b); rickturnerite, Pb 7 O 4 [Mg(OH) 4 ](OH)Cl 3 (Rumsey et al, 2011); and philolithite, [Pb 2 O] 6 [Mn(Mg,Mn) 2 (Mn,Mg) 4 (OH) 12 (SO 4 )(CO 3 ) 4 ]Cl 4 (Kampf et al, 1998;Moore et al, 2000). These minerals are similar to vladkrivovichevite in that they contain structural units based upon oxocentred OPb 4 tetrahedra (Siidra and Krivovichev, 2008;Siidra et al, 2008aSiidra et al, , 2011.…”

Section: Relationship To Other Speciesmentioning

confidence: 99%

Hereroite and vladkrivovichevite: two novel lead oxychlorides from the Kombat mine, Namibia

Turner¹,

Siidra²,

Rumsey³

et al. 2012

Mineral. mag.

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Two new lead oxychloride minerals, hereroite [Pb32(O, ☐)21](AsO4)2((Si,As,V,Mo)O4)2Cl10 and vladkrivovichevite [Pb32O18][Pb4Mn2O]Cl14(BO3)8·2H2O occur in association with asisite, damaraite, kombatite, sahlinite, copper, quartz, barysilite, Mn silicates and a number of Mn oxyhydroxide minerals on a specimen from the Kombat mine in Namibia. The minerals formed as late-stage products of hydrothermal reworking of primary sulfide minerals.Hereroite is monoclinic, C2/c with a = 23.14(1), b = 22.65(1), c = 12.39(1) Å, β = 102.00(5)°, V = 6351.6(41) Å3 from powder-diffraction data and a = 23.139(4), b = 22.684(4), c = 12.389(2) Å, β = 102.090(3)°, V = 6358.8(18) Å3 from single-crystal data. It is bright orange, with white streak and adamantine lustre. It is brittle with no observed parting or cleavage and has a conchoidal fracture. The calculated density is 8.15 g cm–3. The mean refractive index in air at 589 nm is 2.38. The six strongest reflections in the X-ray powder diffraction pattern [d in Å, (I), (hkl)] are as follows: 2.982(100)(51); 2.795(47)(80); 1.986(24)(8); 1.641(24)(11..); 3.512(23)(61); 3.901(21)(511). Hereroite is named for the Herero people, one of the indigenous tribal groupings in the region where the Kombat mine is located.Vladkrivovichevite is orthorhombic, Pmmn with a = 12.87(5), b = 27.7(4), c = 11.46(3) Å, V = 4080.1(5) Å3, from powder-diffraction data and a = 12.759(1), b = 27.169(4), c = 11.515(1) Å, V = 3992.0(9) Å3, Z = 2, from single-crystal data. It is pale greenish yellow, with white streak and adamantine lustre. It is brittle with no observed parting or cleavage and has a conchoidal fracture. The calculated density is 7.40 g cm–3. The mean refractive indices in air at 589 nm are 2.30 and 2.34. The six strongest reflections in the X-ray powder diffraction pattern [d in Å, (I), (hkl)] are as follows: 2.860(100)(370); 2.733(84)(073); 3.707(49)(073); 3.068(37)(401); 2.075(32)(473); 1.601(32)(3.14.3). Vladkrivovichevite is named in honour of Prof. Dr Vladimir Gerasimovich Krivovichev (b. 24.04.1946), Head of the Department of Mineralogy, Geological Faculty, St Petersburg State University.The crystal structures of hereroite and vladkrivovichevite consist of alternating litharge-like O – Pb double layers and chlorine sheets and both are structurally related to other layered lead oxychlorides. In hereroite, tetrahedral AsO4 and (Si, As, V, Mo)O4 groups locate in defects within the O – Pb block, which combines square 'symesite-type' and double-square 'kombatite-type' cavities in its crystal structure. The structure of vladkrivovichevite is based on O – Pb derivative blocks with the interlayer occupied by Cl– anions and oxocentred OPb4Mn2 octahedra whose eight triangular faces are capped by triangular borate anions, BO33–.

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The crystal structure of philolithite, a trellis-like open framework based on cubic closest-packing of anions

Cited by 24 publications

References 4 publications

Anion-Centered Tetrahedra in Inorganic Compounds

Anion-Centered Tetrahedra in Inorganic Compounds

[Pb2F2](SeO4): a heavier analogue of grandreefite, the first layered fluoride selenate

Hereroite and vladkrivovichevite: two novel lead oxychlorides from the Kombat mine, Namibia

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