IMA 2017-048 = graftonite-(Ca); IMA 2017-050 = graftonite-(Mn)

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Marco E. Ciriotti
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IMA 2017-048 = graftonite-(Ca); IMA 2017-050 = graftonite-(Mn)

Messaggio da Marco E. Ciriotti » ven 18 mag, 2018 17:55

Prossima pubblicazione.

Referenza:
▪ Pieczka, A., Hawthorne, F.C., Ball, N., Abdu, Y., Gołębiowska, B., Włodek, A., Żukrowski, J. (2018): Graftonite-(Mn), ideally M1MnM2,M3Fe2(PO4)2, and graftonite-(Ca), ideally M1CaM2,M3Fe2(PO4)2, two new minerals of the graftonite group from Poland. Mineralogical Magazine, 82, (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: 24920
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Re: IMA 2017-048 = graftonite-(Ca); IMA 2017-050 = graftonite-(Mn)

Messaggio da Marco E. Ciriotti » sab 10 nov, 2018 13:35

Referenza:
▪ Pieczka, A., Hawthorne, F.C., Ball, N., Abdu, Y., Gołębiowska, B., Włodek, A., Żukrowski, J. (2018): Graftonite-(Mn), ideally M1MnM2,M3Fe2(PO4)2, and graftonite-(Ca), ideally M1CaM2,M3Fe2(PO4)2, two new minerals of the graftonite group from Poland. Mineralogical Magazine, 82, (in press).

Abstract:
Two new minerals of the graftonite group, graftonite-(Mn), ideally M1MnM2,M3Fe2(PO4)2, and graftonite-(Ca), ideally M1CaM2,M3Fe2(PO4)2, were discovered in phosphate nodules of two beryl-columbite-phosphate pegmatites, respectively at Lutomia and Michałkowa in the Góry Sowie Block, Lower Silesia, SW Poland. Graftonite-(Mn) is pinkish brown, whereas graftonite-(Ca) shows more brownish coloration. Both minerals have a vitreous luster, a good cleavage Graftonite-(Ca) was collected at Michałkowa, 50°45’N, 16°27’E, in the middle part of the Góry Sowie Block, ~70 km SW of Wrocław, on a small pegmatite dump, a relic of excavation in the 19th century as a source of quartz and feldspar. During this work, Websky (1868) found and described sarcopside (type locality, TL), associated with hureaulite, vivianite and an apatite-group mineral. The dump is located on the left site of the Dział Michałowski Range, on the right side of the Młynówka stream, about 100 m from the Zagórze Śląskie – Lubachów – Michałkowa – Pieszyce road. The original pegmatite vein, ~10–12 m in length and 2–4 m in thickness, with visible zoning (wall zone – graphic zone – blocky feldspar zone), was composed of albite, microcline, quartz, muscovite, biotite, schorl evolving to foitite, almandine, sillimanite, andalusite and phosphate minerals in nodules reaching a few centimeters in diameter (Łodziński and Sitarz, 2009). Graftonite-(Ca) was found in an outer zone of a small phosphate nodule (~2 cm in diameter) collected on the dump. The nodule was composed mainly of lamellar intergrowths of the primary magmatic phosphates: sarcopside and graftonite-(Mn), with minor triphylite oxidized topotactically to ferrisicklerite and heterosite. In this zone, the magmatic phosphates underwent intensive Na and Ca metasomatism and were replaced by wolfeite, alluaudite, maneckiite, fluor- and hydroxylapatite, in places forming fine-grained mosaics (Pieczka et al., 2017a). To date, ~50 phosphate minerals has been identified in the pegmatite (Grochowina, 2016), with such rare species as maneckiite (TL), wicksite, willieite, ferrowillieite, qingheiite-(Fe), maghagendorfite, hagendorfite, ferrohagendorfite, johnsomervilleite, lazulite, gormanite, childrenite, souzalite and arrojadite-(KNa). Łodziński and Sitarz (2009) mentioned also the presence of qingheiite, rosemaryite and simferite in nodules of the pegmatite, but these phosphates have not yet been confirmed by chemical analysis or X-ray diffraction.
Marco E. Ciriotti

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