Crystal structure of malhmoodite from Cluster, South Dakota, USA

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Marco E. Ciriotti
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Crystal structure of malhmoodite from Cluster, South Dakota, USA

Messaggio da Marco E. Ciriotti » mer 21 lug, 2021 17:12

Prossima pubblicazione.

Referenza:
▪ Yang, H., Gu, X., Loomis, T., Gibbs, R., Downs, R. (2022): The crystal structure of malhmoodite from Cluster, South Dakota, USA. Canadian Mineralogist, 60, (in press).
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Marco E. Ciriotti
Messaggi: 31675
Iscritto il: ven 25 giu, 2004 11:31
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Re: Crystal structure of malhmoodite from Cluster, South Dakota, USA

Messaggio da Marco E. Ciriotti » mer 20 apr, 2022 11:09

Prossima pubblicazione.

Referenza:
▪ Yang, H., Gu, X., Loomis, T., Gibbs, R., Downs, R. (2022): The crystal structure of malhmoodite from Cluster, South Dakota, USA. Canadian Mineralogist, 60, (in press).

Abstract:

An occurrence of malhmoodite, Fe2+Zr(PO4)2·4H2O, from the Scott's Rose Quartz mine, Custer County, South Dakota, USA, has been identified. It occurs as divergent groups of yellowish, flat-lying platy crystals on football-size masses of altered löllingite with scorodite, parasymplesite, karibibite, schneiderhöhnite, kahlerite, and zircon. An electron probe microanalysis of malhmoodite yielded an empirical formula (based on 12 O apfu) of Fe1.06(Zr1.10Hf0.03)Σ1.13[(P0.93As0.01)Σ0.94O4]2·4H2O.
Single-crystal X-ray structure analysis shows that malhmoodite is the Fe-analogue of zigrasite, MgZr(PO4)2·4H2O. Malhmoodite is triclinic with space group P-1 and unit-cell parameters a = 5.31200(10), b = 9.3419(3), c = 9.7062(3) Å, α = 97.6111(13), β = 91.9796(11), γ = 90.3628(12)°, V = 477.10(2) Å3, Z = 2, in contrast to the previously reported monoclinic symmetry with space group P21/c and unit-cell parameters a = 9.12(2), b = 5.42(1), c = 19.17(2) Å, β = 94.8(1)°, V = 944.26 Å3, Z = 4. The crystal structure of malhmoodite is characterized by sheets composed of ZrO6 octahedra sharing all vertices with PO4 tetrahedra. These sheets are parallel to (001) and are joined together by the FeO2(H2O)4 octahedra. The structure determination of malhmoodite, along with that of zigrasite, warrants a re-investigation of synthetic compounds M2+Zr(PO4)2·4H2O (M = Mn, Ni, Co, Cu, or Zn) that have been assumed previously to be monoclinic.

NdR: malhmoodite group
Malhmoodite Fe2+Zr(PO4)2·4H2O tric P-1 5.31200 9.3419 9.7062 97.6111 91.9796 90.3628 2 477.1
Zigrasite MgZr(PO4)2·4H2O tric P-1 5.3049 9.3372 9.6282 97.348 91.534 90.512 2 472.777
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Marco E. Ciriotti
Messaggi: 31675
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Re: Crystal structure of malhmoodite from Cluster, South Dakota, USA

Messaggio da Marco E. Ciriotti » sab 28 mag, 2022 9:57

Pubblicazione effettuata.

Referenza:
▪ Yang, H., Gu, X., Loomis, T., Gibbs, R., Downs, R. (2022): The crystal structure of malhmoodite from Cluster, South Dakota, USA. Canadian Mineralogist, 60, 485-492.
Marco E. Ciriotti

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