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GARNIERITE H2 (Ni,Mg) SiO4 GARNIERITE(Jules Garnier) – NAME FOR GREEN NICKEL ORE FOUND IN POCKETS & VEINS IN WEATHERED & SERPENTINIZED ULTRAMAFIC ROCKS; FORMED BY LATERITIC WEATHERING OF ULTRAMAFIC ROCKS • GARNIERITE – MIXTURE OF Ni-Mg-HYDROSILICATES SERPENTINE, TALC, SEPIOLITE, CHLORITE & SMECTITE; THESE MINERALS FORMED IN GARNIERITE IN INTIMATE MIXTURES BLUE-GREEN BANDS OF NICKEL ORE • GARNIERITE COMPOSITION 1. Ni-BEARING TALC – WILLEMSEITE ( UP TO 25 WT % Ni) 2. Ni-LIZARDITE – NEPOUITE (UP TO 34 WT% Ni) 3. NI-SEPIOLITE – FALCONDIOTE (UP TO 24 WT% NiZ) LATERIZATION OF ULTRAMAFIC ROCKS • DISSOLUTION & REMOVAL OF Ni & SiO2 TO RESIDUAL CONCENTRATION OF Ni & Fe IN GOETHITE-RICH SURFACE LAYER(Ni LIMONITE ORE) • PORTION OF Ni IS LEACHED DOWNWARD IN UNDERLYING DECOMPOSED ULTRAMAFIC ROCKS • THIS PROCESS INCREASES Ni TOTAL DECOMPOSED ROCKS(NICKEL SILICATES, NICKEL SAPROLITE) • SMALL AMOUNT OF Ni-RICH GARNIERITE PRECIPATED IN HOLLOW SPACES LIME GREEN GARNIERITE GENERALIZED WEATHERING PROFILE OF ROCK SAPROLITE EXPOSED IN PIEDMONT, HANOVER COUNTY. DARK MATERIAL IS WEATHERED. NOTE HAMMER STUCK IN SAPROLITE-ROTTEN ROCK GOLD LATERITIC – SAPROLITIC DEPOSITS • ELUVIAL Au PLACERS, GOLD-BEARING SAPROLITE Au DISSEMINATED IN LATE• RITE & SAPROLITE DEVE• LOPED UNDER TROPICAL • CONDITIONS OF WEATHER• ING OVER WIDE VARIETY OF • BEDROCKS