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A suite of nickel minerals, gaspéite, retgersite and nickelhexahydrite, was found in veins of altered ultramafic rocks from Dubostica, Bosnia and Hercegovina, in material deposited in the National Museum in Sarajevo. Unit-cell dimensions and vol- umes of the minerals are: gaspéite: a 4.648(3), c 14.95(2) Å (rhombohedral cell a 5.660 Å, 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), 98.55(7)°, V 1715(2) Å3. The chemical composition of the gaspéite from Dubostica, obtained by ICP-AES analysis, 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 three atoms of oxygen) (Ni 0.73Fe0.10Ca0.01)0.84 C1.08O3.00. The association of gaspéite, retgersite and nickelhexahydrite has formed as a result of reactions involving a series of kinetically controlled transitory equilibria, and is characteristic of near-surface hydrothermal alteration.

GASPEITE AND ASSOCIATED Ni-RICH MINERALS FROM VEINS IN ALTERED ULTRABASIC ROCKS FROM DUBOSTICA, BOSNIA AND HERZEGOVINA