Quintinte-1M from the Mariinsky Deposit, Ural emerald mines (Russia)

database, nuove specie, discrediti,
ridefinizioni, classificazioni, ecc.
Rispondi
Avatar utente
Marco E. Ciriotti
Messaggi: 24391
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Quintinte-1M from the Mariinsky Deposit, Ural emerald mines (Russia)

Messaggio da Marco E. Ciriotti » gio 15 mar, 2018 9:32

Referenza:
▪ Zhitova, E.S., Popov, M.P., Krivovichev, S.V., Zaitsev, A.N., Vlasenko, N,S. (2018): Quintinite-1M from the Mariinsky Deposit, Ural Emerald Mines, Central Urals, Russia. Geology of Ore Deposits, 59, 745-751.

Abstract:
The paper describes the first finding of quintinite [Mg4Al2(OH)12][(CO3)(H2O)3] at the Mariinsky deposit in the Central Urals, Russia. The mineral occurs as white tabular crystals in cavities within altered gabbro in association with prehnite, calcite, and a chlorite-group mineral. Quintinite is the probable result of late hydrothermal alteration of primary mafic and ultramafic rocks hosting emerald-bearing glimmerite. According to electron microprobe data, the Mg : Al ratio is ~2 : 1. IR spectroscopy has revealed hydroxyl and carbonate groups and H2O molecules in the mineral. According to single crystal XRD data, quintinite is monoclinic, space group C2/m, a =5.233(1), b = 9.051(2), c = 7.711(2) Å, β = 103.09(3)°, V = 355.7(2) Å3. Based on structure refinement, the polytype of quintinite should be denoted as 1M. This is the third approved occurrence of quintinite-1M in the world after the Kovdor complex and Bazhenovsky chrysotile–asbestos deposit.
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: Bing [Bot] e 8 ospiti