Publication: La zaratita de Cabo Ortegal (A Coruña): historia de su
descubrimiento y caracterización actual
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2014
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Consejo Superior de Investigaciones Científicas, Museo Nacional de Ciencias Naturales
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Abstract
La zaratita, Ni3CO3(OH)4.4H2O es uno de los pocos minerales descubiertos en España. Por ser una fase de baja cristalinidad y presentar una composición química variable según los diferentes yacimientos, la International Mineralogical Association (IMA) actualmente la considera con status Q (questioned). En este artículo se analizan en primer lugar los descubrimientos, casi simultáneos, del mineral español y del llamado “Emerald of Nickel” de Texas, Lancaster County, Pennsilvania (USA), de similar composición química, que dieron lugar a la actual zaratita, donde el mineral español aportó el nombre y el americano la composición química y la descripción de las propiedades físicas. En segundo lugar, se presenta una nueva caracterización de la muestra histórica de zaratita de Cabo Ortegal, por microsonda electrónica, microscopia electrónica de barrido, difracción de rayos-X, análisis termo-gravimétricos y termo-diferenciales, micro-Raman, espectroscopia infrarroja y catodoluminiscencia espectral y se discuten los resultados analíticos.
Zaratite, Ni3CO3(OH)4.4H2O is one of the few minerals discovered in Spain. Taking into account that it is an amorphous compound with variable chemical composition depending on the ore deposits, the International Mineralogical Association (IMA) currently considers zaratita in the Q status (Questionable). In this article we analyze first the nearly simultaneous discoveries of the Spanish zaratite and other material called “Emerald of Nickel” from Texas, Lancaster County, Pennsylvania (USA), of similar chemical composition. Both led to the current zaratite, where the Spanish mineral provides the name and the American one, the chemical composition anc physical properties. In addition, here we also include an experimental characterization of the zaratite historical specimen from Ortegal Cape, by electron microprobe, scanning electron microscopy, X-ray diffraction, differential thermal and thermo-gravimetric analyses, micro-Raman, infrared transmission spectroscopy and spectral cathodoluminescence together with a discussion of the analytical results.
Zaratite, Ni3CO3(OH)4.4H2O is one of the few minerals discovered in Spain. Taking into account that it is an amorphous compound with variable chemical composition depending on the ore deposits, the International Mineralogical Association (IMA) currently considers zaratita in the Q status (Questionable). In this article we analyze first the nearly simultaneous discoveries of the Spanish zaratite and other material called “Emerald of Nickel” from Texas, Lancaster County, Pennsylvania (USA), of similar chemical composition. Both led to the current zaratite, where the Spanish mineral provides the name and the American one, the chemical composition anc physical properties. In addition, here we also include an experimental characterization of the zaratite historical specimen from Ortegal Cape, by electron microprobe, scanning electron microscopy, X-ray diffraction, differential thermal and thermo-gravimetric analyses, micro-Raman, infrared transmission spectroscopy and spectral cathodoluminescence together with a discussion of the analytical results.