%0 Journal Article
%A Tauler, Esperança
%A Proenza, Joaquín A.
%A Galí Medina, Salvador
%A Lewis , John F.
%A Labrador Carrasco, Manuel
%A García Romero, Emilia
%A Súarez Barrios, Mercedes
%A Longo, Francisco
%A Bloise, Giovanni
%T Ni-sepiolite-falcondoite in garnieritemineralization from the FalcondoNi-laterite deposit, Dominican Republic
%D 2009
%@ 0009-8558
%U https://hdl.handle.net/20.500.14352/50683
%X New chemical and structural data on sepiolite-falcondoite in garnierite veins fromthe Falcondo Ni-laterite deposits, central Dominican Republic, are reported. Samples of Ni-sepiolitefalcondoitevary in colour from whitish green to green depending on the NiO content (wt.%) and theamount of silica present. The texture is normally schistose and friable but samples with considerablequartz and/or amorphous silica are compact and hard. Back-scattered electron images indicate thatthe samples are composed of at least three generations of Ni-sepiolite-falcondoite. The extremerefined cell parameters for Ni-sepiolite-falcondoite vary from 13.400(2), 27.006(4), 5.273(1) A˚ to13.340(3), 27.001(6), 5.267(1) A˚ (space group Pncn). As the Ni content increases there is a smallreduction in the a parameter. Chemical compositions determined by electron probe microanalysiscover a large interval of the Ni-sepiolite-falcondoite solid solution (Fal3 and Fal77). Individualsamples show a considerable range in composition with the widest range determined in one samplefrom 4.63 to 22.40 wt.% NiO.
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