IMA 2023-F = minasgeraisite-(Y) discreditation

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Marco E. Ciriotti
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Iscritto il: ven 25 giu, 2004 11:31
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IMA 2023-F = minasgeraisite-(Y) discreditation

Messaggio da Marco E. Ciriotti » sab 02 set, 2023 10:37

Prossima pubblicazione.

Referenza:
▪ Atencio, D. (2023): Minasgeraisite-(Y) discredited as an ordered intermediate between datolite and hingganite-(Y). Mineralogical Magazine, 87, (in press).

Abstract:
Minasgeraisite-(Y) is discredited based on it being an ordered intermediate between datolite and hingganite-(Y) (IMA-CNMNC Proposal 23-F). An idealized formula is (Ca2Y2)□2(Be2B2)Si4O16(OH)4, which corresponds to Ca2□B2Si2O8(OH)2 (datolite) + Y2□Be2Si2O8(OH)2 (hingganite-(Y)). The type material is rich in Bi, the Bi-richest portion yet discovered from the type locality is shown to be an intermediate member between datolite, hingganite-(Y) and a hypothetical end-member phase yet to be found of composition Bi2□Be2Si2O8(OH)2. Minasgeraisite-(Y) has a different space group to datolite and hingganite-(Y). This lowering of symmetry to an acentric triclinic system is caused by different element occupancies on the gadolinite supergroup A-site, which for minasgeraisite-(Y) becomes four individual sites. Such order-disorder of elements is not considered as species defining criteria despite the change in space group. Therefore, minasgeraisite-(Y) is discredited.
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: 31286
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 2023-F = minasgeraisite-(Y) discreditation

Messaggio da Marco E. Ciriotti » ven 03 nov, 2023 16:53

Pubblicazione effettuata.

Referenza:
▪ Atencio, D. (2023): Minasgeraisite-(Y) discredited as an ordered intermediate between datolite and hingganite-(Y). Mineralogical Magazine, 87, 738-740.
Marco E. Ciriotti

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

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