Classification of the minerals of the graftonite group

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Marco E. Ciriotti
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Classification of the minerals of the graftonite group

Messaggio da Marco E. Ciriotti » ven 18 mag, 2018 17:35

Prossima pubblicazione.

Referenza:
▪ Hawthorne, F.C. & Pieczka, A. (2018): Classification of the minerals of the graftonite group. Mineralogical Magazine, 82, (in press).
Marco E. Ciriotti

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Marco E. Ciriotti
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Re: Classification of the minerals of the graftonite group

Messaggio da Marco E. Ciriotti » dom 20 mag, 2018 14:25

Graftonite group

Beusite-(Ca) CaMn2+2(PO4)2
Beusite Mn2+Mn2+2(PO4)2
Graftonite Fe2+Fe2+2(PO4)2
Graftonite-(Ca) CaFe2+2(PO4)2
Graftonite-(Mn) Mn2+Fe2+2(PO4)3
Marco E. Ciriotti

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Marco E. Ciriotti
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Re: Classification of the minerals of the graftonite group

Messaggio da Marco E. Ciriotti » lun 28 gen, 2019 15:14

Pubblicazione effettuata.

Referenza:
▪ Hawthorne, F.C. & Pieczka, A. (2018): Classification of the minerals of the graftonite group. Mineralogical Magazine, 82, 1301-1306.

Abstract:
A classification and nomenclature scheme has been approved by the International Mineralogical Association Commission on New Minerals, Nomenclature and Classification for the minerals of the graftonite group. The crystal structures of these minerals have three distinct sites that are occupied by Fe2+, Mn2+ and Ca2+. These sites have coordination numbers [8], [5] and [6], and these differences lead to very strong order of Fe2+, Mn2+ and Ca2+ over these sites. As a result of this strong order, the following compositions have been identified as distinct species: graftonite: FeFe2(PO4)2; graftonite-(Ca): CaFe2(PO4)2; graftonite-(Mn): MnFe2(PO4)2; beusite: MnMn2(PO4)2; and beusite-(Ca): CaMn2(PO4)2.
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