 | Díaz-Acha, Yael, Campeny, Marc, Casas, Lluís, Di Febo, Roberta, Ibañez-Insa, Jordi, Jawhari, Tariq, Bosch, Josep, Borrell, Ferran, Jorge-Villar, Susana Esther, Greneche, Jean-Marc, Tauler, Esperança, Melgarejo, Joan Carles (2022) Colours of Gemmy Phosphates from the Gavà Neolithic Mines (Catalonia, Spain): Origin and Archaeological Significance. Minerals, 12 (3) 368 doi:10.3390/min12030368 | Journal (article/letter/editorial) | | from the Gavà Neolithic Mines (Catalonia, Spain): Origin and Archaeological Significance Yael Díaz-Acha...Jorge-Villar 8 , Jean-Marc Greneche 9 , Esperança Tauler 10 and Joan Carles Melgarejo 10 1 2 3 4 5 6 7 8 ...* Museu de Ciències Naturals de Barcelona, Parc de la Ciutadella s/n, 08003 Barcelona, Spain; mcampenyc@bcn...mcampenyc@bcn.cat Departament de Geologia, Universitat Autònoma de Barcelona (UAB), Edifici C, 08193 Cerdanyola...Cerdanyola del Vallès, Spain; lluis.casas@uab.cat Institut Català d’Arqueologia Clàssica (ICAC), Plaça d’en |  | MATSUBARA, SATOSHI, SAITO, YASUJI, KATO, AKIRA (1988) Phosphate minerals in chert from Toyoda, Kochi, City, Japan. Journal of Mineralogy, Petrology and Economic Geology, 83 (4) 141-149 doi:10.2465/ganko.83.141 | Journal (article/letter/editorial) | | occurrence were formed on walls came from nearby and cacoxenite of aluminum of fractures fluorapatite...surface condition. The phosphate ion by sulphuric and cacoxenite acid generated indicate from wavellite...ideal one, planerite to be a copper-bearing one, and cacoxenite to be a highly aluminian material, respectively...respectively. The X-ray powder studies on variscite and fluorapatite specify the former to be Messbach-type...some gold-silver deposits in Japan (Ito, 1975; Kato and Matsubara, 1981), they have not been found in sedimentary |  | | Journal (issue) | | Volume 31 / Nos. 3/4 ©2004 Gemmological Association and Gem Testing Laboratory of Great Britain The Gemmological...are understood to be the views of the contributors and not necessarily of the publishers. ©2008 Gemmological...Yasunaga and Hajime Uesugi Abstract: Red or near-red natural diamonds are extremely rare, and the possible...weak absorption band at 776 nm in the visible range and a clear absorption band at 6169 cm-1 in the infrared...orange, blue, green, black, white, purple, pink and red, colours which are traditionally referred to |
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