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Ni-sepiolite-falcondoite in garnierite mineralization from the Falcondo Ni-laterite deposit, Dominican Republic

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Tauler, Esperança and Proenza, Joaquín A. and Galí Medina, Salvador and Lewis , John F. and Labrador Carrasco, Manuel and García Romero, Emilia and Súarez Barrios, Mercedes and Longo, Francisco and Bloise, Giovanni (2009) Ni-sepiolite-falcondoite in garnierite mineralization from the Falcondo Ni-laterite deposit, Dominican Republic. Clay minerals, 44 . pp. 435-454. ISSN 0009-8558

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Abstract

New chemical and structural data on sepiolite-falcondoite in garnierite veins from
the Falcondo Ni-laterite deposits, central Dominican Republic, are reported. Samples of Ni-sepiolitefalcondoite
vary in colour from whitish green to green depending on the NiO content (wt.%) and the
amount of silica present. The texture is normally schistose and friable but samples with considerable
quartz and/or amorphous silica are compact and hard. Back-scattered electron images indicate that
the samples are composed of at least three generations of Ni-sepiolite-falcondoite. The extreme
refined cell parameters for Ni-sepiolite-falcondoite vary from 13.400(2), 27.006(4), 5.273(1) A˚ to
13.340(3), 27.001(6), 5.267(1) A˚ (space group Pncn). As the Ni content increases there is a small
reduction in the a parameter. Chemical compositions determined by electron probe microanalysis
cover a large interval of the Ni-sepiolite-falcondoite solid solution (Fal3 and Fal77). Individual
samples show a considerable range in composition with the widest range determined in one sample
from 4.63 to 22.40 wt.% NiO.


Item Type:Article
Uncontrolled Keywords:Ni-sepiolite, Falcondoite, Garnierite, Crystal chemistry, Falcondo, Ni-laterites, Dominican Republic
Subjects:Sciences > Geology > Mineralogy
ID Code:21650
Deposited On:03 Jun 2013 12:04
Last Modified:11 Dec 2018 08:46

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