Nomenclatura supergruppo dei piroclori

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Nomenclatura supergruppo dei piroclori

Messaggio da edgardo » mer 05 gen, 2011 9:40

Come andrà a finire per i nostri "piroclori"? Dovremo scrivere "minerale del supergruppo dei piroclori"?

The Canadian Mineralogist Vol. 48, pp. 673-698 (2010)

THE PYROCHLORE SUPERGROUP OF MINERALS: NOMENCLATURE

hydropyrochlore, hydroxykenomicrolite, hydroxycalcioroméite, hydrokenoelsmoreïte, hydroxycalciopyrochlore, fluorcalciopyrochlore, kenoplumbomicrolite, oxycalciobetafite, fluornatroroméite. Les noms suivants deviennent désuets: alumotungstite, bariomicrolite, bariopyrochlore, bindheimite, bismutomicrolite, bismutopyrochlore, bismutostibiconite, calciobetafite, ceriopyrochlore-(Ce), cesstibtantite, ferritungstite, jixianite, kalipyrochlore, monimolite, natrobistantite, partzite, plumbobetafite, plumbomicrolite, plumbopyrochlore, stannomicrolite, stetefeldtite, stibiconite, stibiobétafite, stibiomicrolite, strontiopyrochlore, uranmicrolite, uranpyrochlore, yttrobetafite-(Y), yttropyrochlore-(Y).

Keywords: pyrochlore supergroup, nomenclature, pyrochlore group, microlite group, betafite group, roméite group, elsmoreite group.

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Marco E. Ciriotti
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Re: Nomenclatura supergruppo dei pyroclori

Messaggio da Marco E. Ciriotti » mer 05 gen, 2011 10:45

L'argomento è stato ampiamente trattato in ben altri due topic e ad essi si rimanda:

viewtopic.php?f=5&t=6807

viewtopic.php?f=5&t=7474
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: 24913
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Re: Nomenclatura supergruppo dei piroclori

Messaggio da Marco E. Ciriotti » mer 15 ago, 2018 11:07

Referenza:
▪ Atencio, D. & Andrade, M. (2018): Growth of the pyrochlore supergroup. IMA2018 Abstract book. The ever-growing mineral diversity in the Earth and the Solar System: new minerals, including nano- and biominerals, and related nomenclature/classification issues, 353.

Abstract:
Twenty seven pyrochlore supergroup mineral species are currently distributed into seven groups. However, when the new nomenclature system of such a supergroup was introduced (Atencio et al. 2010) only seven mineral species, namely oxycalciopyrochlore, hydropyrochlore, hydroxykenomicrolite, oxystannomicrolite, oxystibiomicrolite, hydroxycalcioroméite, and hydrokenoelsmoreite were valid and distributed into five groups (pyrochlore, microlite, roméite, betafite, and elsmoreite). The seven species belong to the cubic crystal system and space group Fd-3m and O is predominant in the X structural site. The 20 new mineral species described between 2010 and 2017 are cesiokenopyrochlore, fluorcalciopyrochlore, fluornatropyrochlore, hydrokenopyrochlore, hydroxycalciopyrochlore, hydroxykenopyrochlore, hydroxymanganopyrochlore, fluorcalciomicrolite, fluornatromicrolite, hydrokenomicrolite, hydroxycalciomicrolite, kenoplumbomicrolite, oxynatromicrolite, fluorcalcioroméite, hydroxyferroroméite, oxycalcioroméite, oxyplumboroméite, fluornatrocoulsellite, hydrokenoralstonite, and hydroxykenoelsmoreite. F is predominant in the X structural site of coulsellite and ralstonite, the two new group names introduced (Atencio et al. 2017). Among such new species, hydroxycalciomicrolite belongs to a different space group of the cubic system, i.e., P4232 (Andrade et al. 2017) and some mineral species crystallize in the trigonal system. Mills et al. (2016) demonstrated hydrokenoelsmoreite occurs as 3C (Fd-3m) and 6R (R-3) polytypes. Hydrokenomicrolite occurs as 3C (Fd-3m) and 3R (R-3m) polytypes, of which the latter corresponds to the discredited “parabariomicrolite” (Atencio 2016). Fluornatrocoulsellite and hydroxykenoelsmoreite crystallize as 3R (R-3m) and 6R (R-3) polytypes, respectively (Mills et al. 2017). As a mineral group consists of two or more minerals (Mills et al. 2009), ralstonite, coulsellite and betafite cannot be considered mineral groups. Hydrokenoralstonite and fluornatrocoulsellite should be designated as unassigned members of the pyrochlore supergroup, because no other member enables the establishment of groups. No valid mineral can be assigned to the betafite group but surely there are several new pyrochlore supergroup minerals to be described.
Marco E. Ciriotti

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