IMA 2016-K = discreditation of tombarthite-(Y)

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Marco E. Ciriotti
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IMA 2016-K = discreditation of tombarthite-(Y)

Messaggio da Marco E. Ciriotti » mer 30 mag, 2018 13:41

Prossima pubblicazione.

Referenza:
▪ Friis, H. (2018): Discreditation of tombarthite-(Y). 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: 24819
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 2016-K = discreditation of tombarthite-(Y)

Messaggio da Marco E. Ciriotti » ven 09 nov, 2018 20:35

Pubblicazione effettuata.

Referenza:
▪ Friis, H. (2018): Discreditation of tombarthite-(Y). Mineralogical Magazine, 82, 1131-1139.

Abstract:
Tombarthite-(Y) is discredited as a mineral species. No type material was available, but material used for the original description has been located and neotype material defined. The main reason for the erroneous description of tombarthite-(Y) is the result of chemical analyses being carried out on heated material, which removed elements such as C and F. New semi-quantitative chemical analyses show that at least F is present in the fresh material, but absent after a heating scheme identical to that of the original description. Modern powder X-ray diffraction methods (XRD) confirm that the material identified as tombarthite-(Y) is a mixture of metamict and crystalline phases. Consequently, what was known as tombarthite-(Y) is not a mixture of the same minerals in equal amounts in different samples, but mixtures of various minerals depending on the sample. The main minerals identified are thalénite-(Y), xenotime-(Y) and kainosite-(Y). The discreditation of tombarthite-(Y) relies on new analyses of a large number of samples from the collection of the Natural History Museum (NHM) in Oslo and has been approved by the International Mineralogical Association Commission on New Minerals, Nomenclature and Classification (proposal 16-K).
Marco E. Ciriotti

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