Cronstedtite polytypes in the Paris meteorite

database, nuove specie, discrediti,
ridefinizioni, classificazioni, ecc.
Rispondi
Avatar utente
Marco E. Ciriotti
Messaggi: 24933
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Cronstedtite polytypes in the Paris meteorite

Messaggio da Marco E. Ciriotti » lun 26 feb, 2018 11:38

Prossima pubblicazione.

Referenza:
▪ Pignatelli, I., Mugnaioli, E., Marrocchi, Y. (2018): Cronstedtite polytypes in the Paris meteorite. European Journal of Mineralogy, 30, (in press).
Marco E. Ciriotti

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

Avatar utente
TOSATO FABIO
Messaggi: 6246
Iscritto il: ven 13 gen, 2006 11:39
Località: via A.Cantele n.15 35129 PADOVA

Re: Cronstedtite polytypes in the Paris meteorite

Messaggio da TOSATO FABIO » lun 26 feb, 2018 19:34

Complimenti agli autori.
Tosato Fabio
"Il vero viaggio di scoperta non consiste nel cercare nuove terre, ma nell'avere nuovi occhi." M. Proust
Noi siamo anche quello che non siamo riusciti ad essere.
Sic transit gloria mundi.

Avatar utente
Marco E. Ciriotti
Messaggi: 24933
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: Cronstedtite polytypes in the Paris meteorite

Messaggio da Marco E. Ciriotti » sab 09 giu, 2018 15:22

Referenza:
▪ Pignatelli, I., Mugnaioli, E., Marrocchi, Y. (2018): Cronstedtite polytypes in the Paris meteorite. European Journal of Mineralogy, 30, (in press).

Abstract:
The first detailed crystallo-chemical and crystallographic description of cronstedtite with extraterrestrial origin has been presented in this study. The analysed crystals have been found in the Paris meteorite, which is the least altered carbonaceous chondrite currently known, and they result from the pseudomorphism of anhydrous silicates. 3D electron diffraction data have been collected by electron diffraction tomography and used to identify the cronstedtite polytypes, because of their small size. All identified polytypes are MDO (Maximum degree of order), and the most abundant one is 1T. Many other crystals also belong to the Bailey's group (or OD subfamily) C, but their stacking disorder hampers the polytype identification. Only in one crystal, the 3T and 2M1 polytypes are recognised. TEM-EDX data indicate that the chemical composition of the crystals is similar, regardless their polytypic sequence.
Marco E. Ciriotti

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

Rispondi

Chi c’è in linea

Visitano il forum: Bing [Bot] e 4 ospiti