Crystal chemistry of turkestanite (Dara-i-Pioz massif, Tajikistan)

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:

Crystal chemistry of turkestanite (Dara-i-Pioz massif, Tajikistan)

Messaggio da Marco E. Ciriotti » ven 20 gen, 2023 10:42

Prossima pubblicazione.

▪ Kaneva, E., Radomskaya, T., Belozerova, O., Shendrik, R. (2023): Crystal chemistry of turkestanite (Dara-i-Pioz massif, Tajikistan). Mineralogical Magazine, 87, (in press).

Abstract:
The results of combined single-crystal X‑ray diffraction, electron probe microanalysis, Fourier microspectroscopy, and photoluminescence spectroscopy study of the crystals of turkestanite from the Dara-i-Pioz deposit (Tien-Shan Mountains, Tajikistan) are reported. It is a single-layer sheet silicate belonging to the ekanite group with a steacyite structural type. Averaged major element analysis provided (wt%): K2O 4.13(6), CaO 8.1(1), Na2O 2.3(1), ThO2 25.8(4), UO2 3.6(4) and SiO2 55.9(1). The averaged crystal-chemical formula for the studied turkestanite is (Th0.84U0.12)(Ca1.24Na0.65)(K0.75☐0.25)Si8O19.72(OH)0.28. From single-crystal structural refinement, turkestanite resulted tetragonal, space group P4/mcc, a = 7.5708(3) Å, c = 14.7300(11) Å, V = 844.27(6) Å3, Z = 2. The luminescence of the uranyl ion (UO2)2+ is observed in turkestanite. In the excitation spectrum, the bands corresponding to a charge transfer transition from the 2p states of the ligand to the 5f state of uranium were found.

NdR: I minerali del gruppo della gillespite hanno lo stesso tipo di struttura.
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: Crystal chemistry of turkestanite (Dara-i-Pioz massif, Tajikistan)

Messaggio da Marco E. Ciriotti » mar 16 mag, 2023 15:10

Pubblicazione effettuata.

Referenza:
▪ Kaneva, E., Radomskaya, T., Belozerova, O., Shendrik, R. (2023): Crystal chemistry of turkestanite (Dara-i-Pioz massif, Tajikistan). Mineralogical Magazine, 87, 252-261.
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 42 ospiti