IMA 2018-020 = stefanweissite

database, nuove specie, discrediti,
ridefinizioni, classificazioni, ecc.
Rispondi
Avatar utente
Marco E. Ciriotti
Messaggi: 25910
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

IMA 2018-020 = stefanweissite

Messaggio da Marco E. Ciriotti » lun 21 gen, 2019 20:10

Prossima pubblicazione.

Referenza:
▪ Chukanov, N.V., Zubkova, N.V., Pekov, I.V., Vigasina, M.F., Polekhovsky, Y.S., Ternes, B., Schüller, W., Britvin, S.N., Pushcharovsky, D.Yu. (2019): Stefanweissite, (Ca,REE)2Zr2(Nb,Ti)(Ti,Nb)2Fe2+O14, a new zirconolite-related mineral from the Eifel paleovolcanic region, Germany. Mineralogical Magazine, 83, (in press).

Abstract:
The new mineral stefanweissite was discovered in sanidinite volcanic ejecta from the Laach Lake (Laacher See) paleovolcano, Eifel region, Rhineland-Palatinate, Germany. Associated minerals are sanidine, nosean, biotite, augite, titanite, ferriallanite-(La), magnetite, baddeleyite, and a pyrochlore-group mineral. Stefanweissite is brown, reddish-brown, with adamantine lustre; the streak is light brown to yellow. It forms long-prismatic crystals up to 0.03  0.07  1.0 mm and acicular crystals up to 2 mm long and 0.02 mm thick typically combined in radiated aggregates in cavities in sanidinite. D(calc.) = 5.254 g/cm3. Mean refractive index calculated from the Gladstone-Dale equation is 2.260. Raman spectrum shows the absence of hydrogen-bearing groups. The chemical composition is (electron microprobe, wt.%): CaO 7.63, MnO 2.51, FeO 7.86, Al2O3 0.25, La2O3 2.28, Ce2O3 6.54, Pr2O3 1.01, Nd2O3 1.59, ThO2 3.71, UO2 1.09, TiO2 17.32, ZrO2 28.03, HfO2 0.91, Nb2O5 19.96, total 99.69. The empirical formula based on 14 O apfu is Ca1.13(Ce0.33La0.12Nd0.08Pr0.05)0.58Th0.12U0.03Mn0.29Fe0.91Al0.04Zr1.89Hf0.04Ti1.80Nb1.19O14. The simplified formula is (Ca,REE)2Zr2(Nb,Ti)(Ti,Nb)2Fe2+O14. Stefanweissite is orthorhombic, space group Cmca. The unit-cell parameters are: a = 7.2896(4) Å, b = 14.1435(5) Å, c = 10.1713(4) Å, V = 1048.68(7) Å3. The crystal structure was solved using single-crystal X-ray diffraction data. Stefanweissite is an analogue of zirconolite-3O with Nb dominant over Ti in one of two octahedral sites. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] are: 2.983 (100) (202), 2.897 (71) (042), 1.828 (38) (154, 400, 333), 1.793 (25) (244), 1.767 (16) (080), 1.517 (10) (282), 1.187 (19) (483, 1.11.3, 602). Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, with the registration number 5191/1.
Marco E. Ciriotti

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

Avatar utente
TOSATO FABIO
Messaggi: 6544
Iscritto il: ven 13 gen, 2006 11:39
Località: via A.Cantele n.15 35129 PADOVA

Re: IMA 2018-020 = stefanweissite

Messaggio da TOSATO FABIO » mar 22 gen, 2019 7:00

Stefan Weiss è della rivista Lapis?
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: 25910
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: IMA 2018-020 = stefanweissite

Messaggio da Marco E. Ciriotti » mar 22 gen, 2019 8:33

Stefan Weiss è della rivista Lapis?
Sì, sì, è lui.
Marco E. Ciriotti

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

giorgiobizzo
Messaggi: 213
Iscritto il: lun 02 gen, 2017 17:34
Località: lugano
Contatta:

Re: IMA 2018-020 = stefanweissite

Messaggio da giorgiobizzo » mar 22 gen, 2019 15:20

Era ora !
Dopo 40 anni di intenso lavoro come redattore della rivista Lapis (mensile).
Bravo Stefan !

Avatar utente
Marco E. Ciriotti
Messaggi: 25910
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: IMA 2018-020 = stefanweissite

Messaggio da Marco E. Ciriotti » mar 22 gen, 2019 16:50

Era ora !
Dopo 40 anni di intenso lavoro come redattore della rivista Lapis (mensile).
Bravo Stefan !
Giusto merito!
Marco E. Ciriotti

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

Avatar utente
Marco E. Ciriotti
Messaggi: 25910
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: IMA 2018-020 = stefanweissite

Messaggio da Marco E. Ciriotti » lun 02 set, 2019 15:16

Pubblicazione effettuata.

Referenza:
▪ Chukanov, N.V., Zubkova, N.V., Pekov, I.V., Vigasina, M.F., Polekhovsky, Y.S., Ternes, B., Schüller, W., Britvin, S.N., Pushcharovsky, D.Yu. (2019): Stefanweissite, (Ca,REE)2Zr2(Nb,Ti)(Ti,Nb)2Fe2+O14, a new zirconolite-related mineral from the Eifel paleovolcanic region, Germany. Mineralogical Magazine, 83, 607-614.

Abstract:
The new mineral stefanweissite was discovered in sanidinite volcanic ejecta from the Laach Lake (Laacher See) paleovolcano, Eifel region, Rhineland-Palatinate, Germany. Associated minerals are sanidine, nosean, biotite, augite, titanite, ferriallanite-(La), magnetite, baddeleyite, and a pyrochlore-group mineral. Stefanweissite is brown, reddish-brown, with adamantine lustre; the streak is light brown to yellow. It forms long-prismatic crystals up to 0.03  0.07  1.0 mm and acicular crystals up to 2 mm long and 0.02 mm thick typically combined in radiated aggregates in cavities in sanidinite. D(calc.) = 5.254 g/cm3. Mean refractive index calculated from the Gladstone-Dale equation is 2.260. Raman spectrum shows the absence of hydrogen-bearing groups. The chemical composition is (electron microprobe, wt.%): CaO 7.63, MnO 2.51, FeO 7.86, Al2O3 0.25, La2O3 2.28, Ce2O3 6.54, Pr2O3 1.01, Nd2O3 1.59, ThO2 3.71, UO2 1.09, TiO2 17.32, ZrO2 28.03, HfO2 0.91, Nb2O5 19.96, total 99.69. The empirical formula based on 14 O apfu is Ca1.13(Ce0.33La0.12Nd0.08Pr0.05)0.58Th0.12U0.03Mn0.29Fe0.91Al0.04Zr1.89Hf0.04Ti1.80Nb1.19O14. The simplified formula is (Ca,REE)2Zr2(Nb,Ti)(Ti,Nb)2Fe2+O14. Stefanweissite is orthorhombic, space group Cmca. The unit-cell parameters are: a = 7.2896(4) Å, b = 14.1435(5) Å, c = 10.1713(4) Å, V = 1048.68(7) Å3. The crystal structure was solved using single-crystal X-ray diffraction data. Stefanweissite is an analogue of zirconolite-3O with Nb dominant over Ti in one of two octahedral sites. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] are: 2.983 (100) (202), 2.897 (71) (042), 1.828 (38) (154, 400, 333), 1.793 (25) (244), 1.767 (16) (080), 1.517 (10) (282), 1.187 (19) (483, 1.11.3, 602). Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, with the registration number 5191/1.
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: Nessuno e 2 ospiti