Spanish palygorskites: mineralogical, textural and crystal-chemical characterization

database, nuove specie, discrediti,
ridefinizioni, classificazioni, ecc.
Rispondi
Avatar utente
Marco E. Ciriotti
Messaggi: 24274
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Spanish palygorskites: mineralogical, textural and crystal-chemical characterization

Messaggio da Marco E. Ciriotti » ven 02 mar, 2018 11:56

Prossima pubblicazione.

Referenza:
▪ Suárez, M., García-Rivas, J., Morales Sánchez-Migallón, J., García-Romero, E. (2018): Spanish palygorskites: geological setting, mineralogical, textural and crystal-chemical characterization. European Journal of Mineralogy, 30, (in press).
Marco E. Ciriotti

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

VINCENZO MILETTO
Messaggi: 440
Iscritto il: mer 31 gen, 2007 16:44
Località: Cavour - Torino

Re: Spanish palygorskites: mineralogical, textural and crystal-chemical characterization

Messaggio da VINCENZO MILETTO » sab 03 mar, 2018 0:18

Ciao Marco,

anche da noi, nel Canavese, é stata trovata.
Potrebbe essere un lavoro necessario anche per la nostra, oppure é un lavoro nuovo e valevole per tutte le località?
-------------------------------------------------------------------------------
Le difficoltà della vita piegano alcuni uomini, ma ne rafforzano altri.
Nelson Mandela
La paura genera energia, ma l' uomo deve sognare per salvarsi.
Walter Bonatti

Avatar utente
Marco E. Ciriotti
Messaggi: 24274
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: Spanish palygorskites: mineralogical, textural and crystal-chemical characterization

Messaggio da Marco E. Ciriotti » sab 03 mar, 2018 12:18

Ciao Marco,
anche da noi, nel Canavese, é stata trovata.
Potrebbe essere un lavoro necessario anche per la nostra, oppure é un lavoro nuovo e valevole per tutte le località?
Credo (occorrerebbe leggere l'articolo non ancora pubblicato) che in buona parte possa valere per tutte le località, anche per la palygorskite di Montestrutto.
Marco E. Ciriotti

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

Avatar utente
Marco E. Ciriotti
Messaggi: 24274
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: Spanish palygorskites: mineralogical, textural and crystal-chemical characterization

Messaggio da Marco E. Ciriotti » sab 09 giu, 2018 15:52

Referenza:
▪ Suárez, M., García-Rivas, J., Morales Sánchez-Migallón, J., García-Romero, E. (2018): Spanish palygorskites: geological setting, mineralogical, textural and crystal-chemical characterization. European Journal of Mineralogy, 30, (in press).

Abstract:
A representative group of palygorskites from the six most important Spanish deposits and six other occurrences were studied comparing their mineralogy, textural features, crystal-chemistry, and surface properties. These palygorskites have different geological origin: (1) sedimentary in large Tertiary continental basins, (2) hydrothermally altered volcanic rocks in the southern Spanish Peninsula, also Tertiary in age; and (3) fault-hosted pure palygorskites. The most common impurities are quartz and carbonates, both calcite and dolomite, but also feldspar, illite, smectite, and sepiolite have been identified. The structural formulae obtained show great variability between samples, as well as with respect to the theoretical formula for palygorskite, as they range from magnesian to aluminous palygorskites. The most common fibre length ranges between 1 and 10 µm but the palygorskites of hydrothermal origin are much longer, with lengths over 10 µm. The shorter fibres give rise to tightened textures, while longer fibres usually generate more open textures. These properties, along with the degree of compaction, condition the porosity of the sample, which in turn influences its surface properties. The specific surface areas obtained range between 30 m2 g−1 and 263 m2 g−1, depending on the impurities content and on the texture and crystal-chemistry; the highest values correspond to Mg-rich palygorskite.
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 6 ospiti