Naslov
Formation conditions of gaspeite and metastable Ni-rich minerals from Duboštica, Bosnia and Hercegovina

Autori
Bermanec, Vladimir ; Sijarić, Galiba ; Kniewald, Goran

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of Abstracts / - Bergamo, 2000, 48-48

Skup
8th International Symposium on Experimental Mineralogy, Petrology and Geochemistry (EMPG)

Mjesto i datum
Bergamo, Italija, 16.04.2000. - 19.04.2000

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Sažetak
A suite of nickel minerals - gaspéite, retgersite and nickelhexahydrite was found in veins crossing altered ultramafic rocks from the Dubostica locality in Bosnia and Hercegovina. Unit cell dimensions of the minerals are: gaspéite a 4.648(3), c 14.95(2) Å (rhombohedral a 5.660 Å, α 48.49°) V 279.7 Å3; retgersite a 6.787(5), c 18.27(2) Å, V 842(1) Å3; nickelhexahydrite a 9.925(7), b 7.232(7), c 24.16(2), β 98.55(7), V 1715(2) Å3. The chemical composition of the Dubostica gaspéite, obtained by ICP-AES is: NiO 49.63, MgO 0.17, CaO 0.45, FeO 6.36, CO2 43.25, (total 99.87 wt.%). This gives the empirical formula (based on 3 oxygens) (Ni0.73Fe0.10Ca0.01)Σ0.84C1.08O3.00. The analysis of an equilibrium Eh-pH model for ionic and complexed nickel species, in terms of the observed mineral association, indicates that the attainment of a series of kinetically controlled transitory equilibria results in the paragenetic formation of metastable mineral phases.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Kemija

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