| Reference Type | Journal (article/letter/editorial) |
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| Title | Redefinition of the formula for aldermanite, [Mg(H2O)6][Na(H2O)2Al3(PO4)2(OH,F)6]⋅H2O, and its crystal structure |
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| Journal | Mineralogical Magazine |
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| Authors | Elliott, Peter | Author |
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| Grey, Ian E. | Author |
| Willis, Anthony C. | Author |
| Year | 2021 (April 14) | Volume | < 85 > |
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| Page(s) | 348-353 | Issue | < 3 > |
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| Publisher | Mineralogical Society |
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| URL | |
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| DOI | doi:10.1180/mgm.2021.36Search in ResearchGate |
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| Generate Citation Formats |
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| Original Entry | Elliott, P., Grey, I.E., Willis, A.C. (2021): Redefinition of the formula for aldermanite, [Mg(H2O)6][Na(H2O)2Al3(PO4)2(OH,F)6]⋅H2O, and its crystal structure. Mineralogical Magazine: 85(3): 348–353. |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 16099756 | Long-form Identifier | mindat:1:5:16099756:5 |
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| GUID | 0 |
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| Full Reference | Elliott, Peter, Grey, Ian E., Willis, Anthony C. (2021) Redefinition of the formula for aldermanite, [Mg(H2O)6][Na(H2O)2Al3(PO4)2(OH,F)6]⋅H2O, and its crystal structure. Mineralogical Magazine, 85 (3). 348-353 doi:10.1180/mgm.2021.36 |
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| Plain Text | Elliott, Peter, Grey, Ian E., Willis, Anthony C. (2021) Redefinition of the formula for aldermanite, [Mg(H2O)6][Na(H2O)2Al3(PO4)2(OH,F)6]⋅H2O, and its crystal structure. Mineralogical Magazine, 85 (3). 348-353 doi:10.1180/mgm.2021.36 |
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| In | Link this record to the correct parent record (if possible) |
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| Abstract/Notes | AbstractAldermanite from Tom's quarry in the Kapunda–Angaston area of the Mount Lofty Ranges, South Australia has been characterised by electron microprobe analyses and single-crystal structure analysis. The empirical formula is Na0.72K0.13Ca0.06Mg1.15Al2.92(PO4)2.05[(OH)2.92F2.96]Σ5.88⋅8.91H2O, based on 23 anions. Analysis of a specimen from the type locality, the nearby Klemm's quarry, Moculta, gave a similar formula, Na0.59K0.06Ca0.36Mg0.92Al3.16(PO4)1.97[(OH)4.08F2.70]Σ6.78⋅8.36H2O. Na and F were not analysed in the original description of the mineral. The ideal end-member formula is [Mg(H2O)6][Na(H2O)2Al3(PO4)2(OH)6]⋅H2O, compared to the original formula of Mg5Al12(PO4)8(OH)22⋅nH2O withn≈ 32. Aldermanite is monoclinic,P21/cwitha= 13.524(3),b= 9.958(2),c= 7.013(1) Å and β = 97.40(3)°. The crystal structure of aldermanite is built from sawtooth layers ofcis- andtrans-corner-connected, Al-centred octahedra, decorated with corner-connected PO4tetrahedra to give (100) layers of composition Al3(PO4)2(OH,F)6. Interlayer Mg(H2O)6octahedra and H2O molecules hold the layers together through H bonding. The corner-connected octahedra form 6-membered rings that are centred by 8-coordinated Na and have a topology identical to a 3-octahedra-wide {110} slice of the pyrochlore structure. This pyrochlore element contains intersecting kagomé nets of Al atoms, parallel to (111) and (11$\bar{1}$) of cubic pyrochlore. Minerals of the walentaite group, as well as zirconolite-3Opolytypes have the same type of intersecting kagomé nets of small cations. |
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