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Título: | Colours of Gemmy Phosphates from the Gavà Neolithic Mines (Catalonia, Spain): Origin and Archaeological Significance |
Autor: | Díaz-Acha, Yael; Campeny, Marc; Casas, Lluís; Di Febo, Roberta; Ibáñez Insa, Jordi CSIC ORCID ; Jawhari, Tariq; Bosch, Josep; Borrell, Ferran ; Jorge-Villar, Susana Esther; Grenèche, Jean Marc; Tauler, Esperança; Melgarejo, Joan Carles | Palabras clave: | Turquoise Variscite Neolithic mines Phosphates Colour Gavà |
Fecha de publicación: | 17-mar-2022 | Editor: | Multidisciplinary Digital Publishing Institute | Citación: | Minerals, 12(3): 368 (2022) | Resumen: | In the Neolithic Gavà mines, variscite and turquoise were exploited for ornaments manufacturing, although some prospective pits and tunnels were dug on other similar greenish minerals such as smectite or kandite. A 3D study of the distribution of mineral phases allows us to determine the parameters involved in variscite colours. Methods are comprised of quantitative colourimetry, thin section petrography, SEM-BSE-EDS, EMPA, XRD, Raman spectroscopy, and57Fe Mössbauer spectrometry. Mapping of the mines indicates that colour is not directly dependent on depth. Although variscite from Gavà is poor in Cr3+ and V+3 compared with gemmy variscite from other localities, the deep green samples content has the highest values of Cr3+. In the case of cryptocrystalline mixtures with jarosite, phosphosiderite, or goethite, variscite tends to acquire a greenish brown to olivaceous hue. If white minerals such as quartz, kandite, crandallite, or alunite are involved in the mixtures, variscite and turquoise colours become paler. | Versión del editor: | https://doi.org/10.3390/min12030368 | URI: | http://hdl.handle.net/10261/266930 | DOI: | 10.3390/min12030368 | E-ISSN: | 2075-163X |
Aparece en las colecciones: | (Geo3Bcn) Artículos |
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Ibañez_minerals-12-3_00368_2022.pdf | 6,11 MB | Adobe PDF | Visualizar/Abrir |
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