IMA 2017-044 = kalithallite

database, nuove specie, discrediti,
ridefinizioni, classificazioni, ecc.
Rispondi
Avatar utente
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 2017-044 = kalithallite

Messaggio da Marco E. Ciriotti » lun 21 nov, 2022 16:59

Prossima pubblicazione.

Referenza:
▪ Pekov, I.V., Krzhizhanovskaya, M.G., Yapaskurt, V.O., Belakovskiy, D.I., Sidorov, E.G., Zhegunov, P.S. (2023): Kalithallite, K3Tl3+Cl6⋅2H2O, a new mineral with trivalent thallium from the Tolbachik volcano, Kamchatka, Russia. Mineralogical Magazine, 87, (in press).

Abstract:
A new mineral kalithallite, K3Tl3+Cl6∙2H2O, was found in an active fumarole belonging to the Northern fumarole field at the First scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. Kalithallite is a product of the relatively low-temperature (70–150°C) interactions involving high-temperature sublimate minerals, volcanic gas and atmospheric water vapour. The associated minerals are cryobostryxite KZnCl3·2H2O, halite, sylvite, opal, and gypsum. Kalithallite forms lamellar to tabular crystals up to 5 × 30 × 40 μm3 combined in open-work aggregates up to 1 mm across. It is transparent, colourless in individuals and white to pale cream-coloured or pale beige in aggregates, with vitreous lustre. Dcalc = 3.01 g∙cm-3. Kalithallite is optically uniaxial (–), ε = 1.656(3), ω = 1.662(3). The chemical composition (wt.%, electron-microprobe data, H2O calculated bystoichiometry) is: K 17.72, Zn 0.85, Tl 38.76, Cl 35.91, H2Ocalc 5.99, total 99.23. The empirical formula calculated on the basis of K+Zn+Tl+Cl = 10 apfu is K2.72Zn0.06Tl1.14Cl6.08∙2H2O. Kalithallite is tetragonal, I4/mmm, a = 15.9333(5), c = 18.1088(7) Å, V = 4595.2(4) Å3, and Z = 14. The strongest reflections of the powder XRD pattern [d,Å(I)(hkl)] are: 5.98(100)(202); 5.64(36)(220); 3.984(20)(400); 3.528(30)(224); 3.315(22)(422); 2.890(15)(334); 2.817(24)(206, 440). Kalithallite is isotypical to synthetic K3Tl3+Cl6∙2H2O. The crystal structure was refined from the powder XRD data using the Rietveld method, RBragg = 0.55%, Rp = 0.56%, and Rwp = 0.75%. The structure contains octahedra Tl3+Cl6 and K-centred polyhedra of three types: KCl8, KCl8(H2O) and KCl7(H2O)2. The mineral is named as a kalium-thallium ordered compound.

NdR: nel testo si dice che i minerali con tallio come elemento essenziale sono 82. Io ne conto 84 (oltre alla kalithallite manca un solfosale). Inoltre la lafossaite, che è un alunogeno O-free, è stata trovata anche non in fumarole vulcaniche. Infine Tl3+ è anche nell'amgaite. Sono stati raccolti soltanto tre microcampioni.
Marco E. Ciriotti

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

Avatar utente
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 2017-044 = kalithallite

Messaggio da Marco E. Ciriotti » mar 16 mag, 2023 14:58

Pubblicazione effettuata.

Referenza:
▪ Pekov, I.V., Krzhizhanovskaya, M.G., Yapaskurt, V.O., Belakovskiy, D.I., Sidorov, E.G., Zhegunov, P.S. (2022): Kalithallite, K3Tl3+Cl6⋅2H2O, a new mineral with trivalent thallium from the Tolbachik volcano, Kamchatka, Russia. Mineralogical Magazine, 87, 186-193.
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 51 ospiti