The crystal structure of kintoreite, PbFe3(PO4)2(OH,H2O)6

Kharisun,; Taylor, Max R.; Bevan, D. J. M.; Pring, Allan

doi:10.1180/minmag.1997.061.404.12

Cited by 24 publications

(18 citation statements)

References 6 publications

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“…most probably, for woodhouseite, Kato and Radoslovich (1968), Blount (1974) and Kato (1977) found that the divalent Ca ions are disordered around their sites. Similar disorder fix Pb has also been detected in plumbojarosite (Szymahski, 1985), beudantite (Szymanski, 1988;Giuseppetti and Tadini, 1989) and kintoreite (Kharisun et al, 1997).…”

Section: Discussionsupporting

confidence: 53%

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The composition and structure of jeanbandyite and natanite

Betterton¹,

Green

Jewson³

et al. 1998

Mineral. mag.

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The rare iron-tin hydroxide minerals natanite and jeanbandyite occur as small pseudo-octahedral crystals in high-tcmperature Sn-Cu-As vcins at Penberthy Croft Mine and Hingston Downs Quail)', Cornwall. The lattice paramctcrs for jeanbandyite and natanite are reported and compared to previously calculated values. Thc chemical composition of jcanbandyite is discusscd and a significant proportion of divalent Fe and Mn is shown to be prcscnt.

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Section: Discussionsupporting

confidence: 53%

“…Structure determinations of beudantite, PbFe3(As04,S04)(OH,H20)6 (Szymahski, 1988;Giuseppetti and T adini, 1989), and of an arsenatian sulphatian kintoreite, PbFe3(P04,As04,S04)(OH,H20)6 (Kharisun et al. 1997), showed that the X04 anions are disordered and that the space group is R3m.…”

Section: Discussionmentioning

confidence: 99%

The composition and structure of jeanbandyite and natanite

Betterton¹,

Green

Jewson³

et al. 1998

Mineral. mag.

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“…The Pb 2+ ion has a 6s 2 lone pair of electrons, and commonly takes up an off-center position in a site to allow for the volume occupied by the lone pair. Such displacements are reported for a number of alunite-related structures with D = Pb, for example beudantite, PbFe 3 (SO 4 ) (AsO 4 )(OH) 6 (Giuseppetti & Tadini 1989), kintoreite, PbFe 3 (PO 4 ) 2 (OH,H 2 O) 6 (Kharisun et al 1997) and plumbogummite, PbAl 3 (PO 4 ) 2 (OH,H 2 O) 6 (Kolitsch et al 1999). However, in each case, the split atom sites obey the R3m symmetry, and their center-of-gravity remains at the undisplaced central position.…”

Section: Discussionmentioning

confidence: 67%

A NEW CRYSTAL-CHEMICAL VARIATION OF THE ALUNITE-TYPE STRUCTURE IN MONOCLINIC PbZn0.5Fe3(AsO4)2(OH)6

Grey¹,

Mumme²,

Bordet³

et al. 2008

The Canadian Mineralogist

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The crystal structure of a segnitite-related mineral with composition Pb[Zn 0.5  0.5 ]Fe 3 (AsO 4) 2 (OH) 6 ,  = vacancy, from Broken Hill, Australia, has been determined using single-crystal X-ray data. The mineral has monoclinic symmetry, space group C2/c, with a 25.8898(6), b 14.8753(2), c 12.1700(2) Å, b 110.681(1)°, Z = 16. All crystals examined were found to be multiply twinned by 120° rotations about c*, which corresponds with c h of the hexagonal alunite-type subcell. The structure was determined on a twinned crystal with one dominant individual, and refined to R = 0.055 for 4089 reflections with F > 4sF. The general features of the monoclinic structure match those of the prototype rhombohedral alunite-type structure. This involves a rhombohedral stacking of hexagonal tungsten-bronze-type sheets of corner-connected octahedra that share their apical anions with AsO 4 tetrahedra on either side of the layer of octahedra, with Pb atoms located between the layers. However, the structure differs from those of other alunite-type minerals in having zinc atoms ordered in trigonal bipyramidal sites in half of the available six-membered rings of the layers of octahedra. These sites are unoccupied in previously reported alunite-type structures. Ordered displacements of the Pb atoms occur in response to the Zn- ordering.

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“…The crystal-structure refi nement indicates that the arrangement of atoms in gorceixite is similar to that of other members of the alunite-jarosite groups, e.g., crandallite (Blount 1974), dussertite (Kolitsch et al 1999b), fl orencite-(Ce) (Kato 1990), goyazite (Kato 1971(Kato , 1987, kintoreite (Kharisun et al 1997), plumbogummite (Kolitsch et al 1999c), and springcreekite (Kolitsch et al 1999a). The coordination polyhedra of cations in the gorceixite structure are shown in Figure 1.…”

Section: Resultsmentioning

confidence: 83%

THE SYMMETRY AND CRYSTAL STRUCTURE OF GORCEIXITE, BaAl3[PO3(O,OH)]2(OH)6, A MEMBER OF THE ALUNITE SUPERGROUP

Dzikowski

Groat

Jambor

2006

The Canadian Mineralogist

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The crystal structure of the Ba-Al phosphate mineral gorceixite, a 7.0538(3), c 17.2746(6) Å, V 744.4(2) Å 3 , space group R3m, Z = 3, has been refi ned to an R 1 index of 2.3% on the basis of 253 unique refl ections measured using MoK␣ radiation on an automated single-crystal diffractometer. The specimen, from the Rapid Creek area, Yukon Territory, has rhombohedral rather than monoclinic Cm symmetry previously reported for the species. The crystal-structure refi nement shows that the atomic arrangement of gorceixite is similar to that of other members of the alunite supergroup. The Ba-O and Ba-OH distances are 2.825 and 2.859 Å (both ϫ6), respectively, and the volume of the Ba(O,OH) 12 polyhedron is 55.64 Å 3. Energy-dispersion spectra and electronmicroprobe analyses indicate that the site is completely occupied by Ba, but the site occupancy refi nes to 88% occupancy; the reason for this is unclear. The average Al-O,OH and P-O distances are 1.906 and 1.544 Å, respectively, and the OH-H distance is 0.980 Å. Interatomic distances [H...O(2) = 1.904 Å and OH...O(2) = 2.884 Å] and a bond-valence analysis suggest that each O(2) atom is involved in hydrogen bonding (as an acceptor) with three different OH groups. However, the low bond-valence sum for O(2) suggests that it not only acts as an acceptor but functions as a donor as well. No hydrogen-atom sites could be identifi ed from the difference-Fourier map, but the presence of OH groups at the O(2) site would help resolve the problem of charge balance. Assuming equal occupancy of the O(2) site by O and OH, the general formula of gorceixite is BaAl 3 [PO 3 (O,OH)] 2 (OH) 6. Although R3m is the most appropriate space-group for the gorceixite sample studied here, we do not claim that all gorceixite samples crystallize in this space group. Different conditions of formation and compositions might be responsible for the lower symmetry observed previously, but the mechanism to achieve the symmetry lowering remains unclear.

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The crystal structure of kintoreite, PbFe₃(PO₄)₂(OH,H₂O)₆

Cited by 24 publications

References 6 publications

The composition and structure of jeanbandyite and natanite

The composition and structure of jeanbandyite and natanite

A NEW CRYSTAL-CHEMICAL VARIATION OF THE ALUNITE-TYPE STRUCTURE IN MONOCLINIC PbZn0.5Fe3(AsO4)2(OH)6

THE SYMMETRY AND CRYSTAL STRUCTURE OF GORCEIXITE, BaAl3[PO3(O,OH)]2(OH)6, A MEMBER OF THE ALUNITE SUPERGROUP

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