Prossima pubblicazione.
Referenza:
▪ Vereshchagin, O.S., Britvin, S.N., Perova, E.N., Brusnitsyn, A.I., Polekhovsky, Y.S., Shilovskikh, V.V., Bocharov, V.N., van der Burgt, A., Cuchet, S., Meisser, N. (2019): Gasparite-(La), La(AsO4), a new mineral from Mn ores of the Ushkatyn-III deposit, Central Kazakhstan and metamorphic rocks of the Wanni glacier, Switzerland. American Mineralogist, 104, (in press).
NdR: questo arseniato di REE è raramente presente alle miniere di Montaldo, Mondovì, Piemonte e di Prabornaz, Valle d'Aosta.
Referenza:
Ciriotti, M.E., Cadoni, M., Armellino, G., Piccoli, G.C., Ambrino, P., Blass, G., Odicino, G., Ciuffardi, M. (2011) Montaldo di Mondovì Minerali della miniera di manganese e ferro. Micro, 9, 4-21. [as unnamed LaAsO4].
IMA 2018-079 = gasparite-(La)
- Marco E. Ciriotti
- Messaggi: 31675
- Iscritto il: ven 25 giu, 2004 11:31
- Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
- Contatta:
IMA 2018-079 = gasparite-(La)
Marco E. Ciriotti
«Things are interesting only in so far as they relate themselves to other things»
«Things are interesting only in so far as they relate themselves to other things»
- Marco E. Ciriotti
- Messaggi: 31675
- Iscritto il: ven 25 giu, 2004 11:31
- Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
- Contatta:
Re: IMA 2018-079 = gasparite-(La)
Referenza:
▪ Vereshchagin, O.S., Britvin, S.N., Perova, E.N., Brusnitsyn, A.I., Polekhovsky, Y.S., Shilovskikh, V.V., Bocharov, V.N., van der Burgt, A., Cuchet, S., Meisser, N. (2019): Gasparite-(La), La(AsO4), a new mineral from Mn ores of the Ushkatyn-III deposit, Central Kazakhstan and metamorphic rocks of the Wanni glacier, Switzerland. American Mineralogist, 104, 1469-1480.
Abstract:
Gasparite-(La), La(AsO4), is a new mineral (IMA 2018-079) from Mn ores of the Ushkatyn-III deposit, Central Kazakhstan (type locality) and from alpine fissures in metamorphic rocks of the Wanni glacier, Binn Valley, Switzerland (co-type locality). Gasparite-(La) is named for its dominant lanthanide, according to current nomenclature of rare-earth minerals. The occurrences and parageneses in both localities are distinct: minute isometric grains up to 15 μm in size, associated with friedelite, jacobsite, pennantite, manganhumite series minerals (alleghanyite, sonolite), sarkinite, tilasite, and retzian-(La) are typically embedded into calcite-rhodochrosite veinlets (Ushkatyn-III deposit) vs. elongated crystals up to 2 mm in size in classical alpine fissures in two-mica gneiss without indicative associated minerals (Wanni glacier). Their chemical compositions have been studied by EDX and WDX; crystal-chemical formulas of gasparite-(La) from the Ushkatyn-III deposit (holotype specimen) and Wanni glacier (co-type specimen) are (La 0. ], respectively. In polished sections, crystals are yellow and translucent with bright submetallic luster. Selected reflectance values R1 /R2 (λ, nm) for the holotype specimen in air are: 11.19/9.05 (400), 11.45/9.44 (500), 10.85/8.81 (600), 11.23/9.08 (700). The structural characteristics of gasparite-(La) were studied by means of EBSD (holotype specimen), XRD, and SREF (co-type specimen). Gasparite-(La) has a monoclinic structure with the space group P21/n. Our studies revealed that gasparite-(La) from the Ushkatyn-III deposit and Wanni glacier have different origins. La/Ce and As/P/V ratios in gasparite-(La) may be used as an indicator of formation conditions.
▪ Vereshchagin, O.S., Britvin, S.N., Perova, E.N., Brusnitsyn, A.I., Polekhovsky, Y.S., Shilovskikh, V.V., Bocharov, V.N., van der Burgt, A., Cuchet, S., Meisser, N. (2019): Gasparite-(La), La(AsO4), a new mineral from Mn ores of the Ushkatyn-III deposit, Central Kazakhstan and metamorphic rocks of the Wanni glacier, Switzerland. American Mineralogist, 104, 1469-1480.
Abstract:
Gasparite-(La), La(AsO4), is a new mineral (IMA 2018-079) from Mn ores of the Ushkatyn-III deposit, Central Kazakhstan (type locality) and from alpine fissures in metamorphic rocks of the Wanni glacier, Binn Valley, Switzerland (co-type locality). Gasparite-(La) is named for its dominant lanthanide, according to current nomenclature of rare-earth minerals. The occurrences and parageneses in both localities are distinct: minute isometric grains up to 15 μm in size, associated with friedelite, jacobsite, pennantite, manganhumite series minerals (alleghanyite, sonolite), sarkinite, tilasite, and retzian-(La) are typically embedded into calcite-rhodochrosite veinlets (Ushkatyn-III deposit) vs. elongated crystals up to 2 mm in size in classical alpine fissures in two-mica gneiss without indicative associated minerals (Wanni glacier). Their chemical compositions have been studied by EDX and WDX; crystal-chemical formulas of gasparite-(La) from the Ushkatyn-III deposit (holotype specimen) and Wanni glacier (co-type specimen) are (La 0. ], respectively. In polished sections, crystals are yellow and translucent with bright submetallic luster. Selected reflectance values R1 /R2 (λ, nm) for the holotype specimen in air are: 11.19/9.05 (400), 11.45/9.44 (500), 10.85/8.81 (600), 11.23/9.08 (700). The structural characteristics of gasparite-(La) were studied by means of EBSD (holotype specimen), XRD, and SREF (co-type specimen). Gasparite-(La) has a monoclinic structure with the space group P21/n. Our studies revealed that gasparite-(La) from the Ushkatyn-III deposit and Wanni glacier have different origins. La/Ce and As/P/V ratios in gasparite-(La) may be used as an indicator of formation conditions.
Marco E. Ciriotti
«Things are interesting only in so far as they relate themselves to other things»
«Things are interesting only in so far as they relate themselves to other things»
- Marco E. Ciriotti
- Messaggi: 31675
- Iscritto il: ven 25 giu, 2004 11:31
- Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
- Contatta:
Re: IMA 2018-079 = gasparite-(La)
Il lavoro appena pubblicato contiene alcune inesattezze e non menziona occorrenze della specie in alcune altre località, così come segnalato in mindat.org con le relative referenze.
Il gruppo della monazite non accoglie 7 specie minerali ma 11 (vedi nota di Antonio), tutte monocline, gruppo spaziale P21/n.
monazite group
Cheralite CaTh(PO4)2
Crocoite Pb(CrO4)
Gasparite-(Ce) Ce(AsO4)
Gasparite-(La) La(AsO4)
Huttonite Th(SiO4)
Monazite-(Ce) Ce(PO4)
Monazite-(La) La(PO4)
Monazite-(Nd) Nd(PO4)
Monazite-(Sm) Sm(PO4)
Raspite Pb(WO4)
Rooseveltite Bi(AsO4)
Trattandosi di fosfati, arseniati, wolframati, e cromati possono essere, a loro volta, raggruppate nei relativi sottogruppi monazite, rooseveltite, raspite e crocoite.
NdR: Ce-dominant and Nd-analogue of gasparite-(La) also occur at the Montaldo mine.
Il gruppo della monazite non accoglie 7 specie minerali ma 11 (vedi nota di Antonio), tutte monocline, gruppo spaziale P21/n.
monazite group
Cheralite CaTh(PO4)2
Crocoite Pb(CrO4)
Gasparite-(Ce) Ce(AsO4)
Gasparite-(La) La(AsO4)
Huttonite Th(SiO4)
Monazite-(Ce) Ce(PO4)
Monazite-(La) La(PO4)
Monazite-(Nd) Nd(PO4)
Monazite-(Sm) Sm(PO4)
Raspite Pb(WO4)
Rooseveltite Bi(AsO4)
Trattandosi di fosfati, arseniati, wolframati, e cromati possono essere, a loro volta, raggruppate nei relativi sottogruppi monazite, rooseveltite, raspite e crocoite.
NdR: Ce-dominant and Nd-analogue of gasparite-(La) also occur at the Montaldo mine.
Marco E. Ciriotti
«Things are interesting only in so far as they relate themselves to other things»
«Things are interesting only in so far as they relate themselves to other things»
- Antonio Borrelli
- Messaggi: 2387
- Iscritto il: sab 11 feb, 2006 1:35
- Località: Cassino (FR)
- Contatta:
Re: IMA 2018-079 = gasparite-(La)
In realtà 11.
Hai dimenticato la gasparite-(Ce)
Hai dimenticato la gasparite-(Ce)
Antonio
"La vera saggezza sta in colui che sa di non sapere" - Socrate
"La vera saggezza sta in colui che sa di non sapere" - Socrate
- Marco E. Ciriotti
- Messaggi: 31675
- Iscritto il: ven 25 giu, 2004 11:31
- Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
- Contatta:
Re: IMA 2018-079 = gasparite-(La)
Sì, sì, 11, certo. Sorry.
Ora l'ho aggiunta.
Ora l'ho aggiunta.
Marco E. Ciriotti
«Things are interesting only in so far as they relate themselves to other things»
«Things are interesting only in so far as they relate themselves to other things»
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