Publication: Ni-sepiolite-falcondoite in garnierite
mineralization from the Falcondo
Ni-laterite deposit, Dominican Republic
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Publication Date
2009
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Mineralogical Society
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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.