The status of zaratite: investigation of the type specimen from Cape Ortegal, Galicia, Spain



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García Guinea, Javier and La Iglesia Fernández, Ángel and Crespo-Feo, Elena and González del Tánago y del Río, José and Correcher Delgado, Virgilio (2013) The status of zaratite: investigation of the type specimen from Cape Ortegal, Galicia, Spain. European Journal of Mineralogy, 25 (6). pp. 995-1004. ISSN Issn 0935-1221 ; e-Issn1617-4011

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Three zaratite samples from Cape Ortegal (type locality, Spain), Texas, Lancaster County (Pennsylvania) and Heazlewood (Tasmania) were analyzed by electron-probe micro-analysis (EPMA), environmental scanning electron microscopy with energy-dispersive spectrometer (ESEM-EDS), X-ray diffraction (XRD), differential thermal analysis and thermogravimetry (DTA-TG), micro-Raman and Fourier-transform infrared spectrometry (FTIR). The empirical formulae calculated from EPMA exhibit different molar ratios (Ni/CO3, Ni/OH and H2O/Ni), showing that these three samples referred to as ‘zaratite’ are chemically distinct; they are actually close to either anhydrous zaratite (Ortegal), nullaginite (Tasmania) or gaspéite (Pennsylvania). The XRD patterns of the three samples only validate their low-crystallinity character with variable mineral inclusions. Raman and FTIR spectra confirm large similarities among the three samples, in line with the general chemical kinship of these nickel hydroxycarbonate (± hydrate) materials. Our data suggest that the natural nickel hydroxycarbonate materials, collectively referred to as ‘zaratite’ on the basis of colour, occurrence and poor crystallinity, are in fact so diverse in terms of Ni/C/H ratios that the ‘zaratite’ term should not deserve a species status and so remains highly questionable.

Item Type:Article
Uncontrolled Keywords:Zaratite; Cape Ortegal (Galicia, Spain); Pennsylvania; Heazlewood; Nickel hydroxycarbonate hydrate; Raman FTIR; DTA-TG
Subjects:Sciences > Geology > Crystallography
Sciences > Geology > Mineralogy
ID Code:64868
Deposited On:16 Apr 2021 07:47
Last Modified:17 Apr 2021 09:02

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