Nepheline from Guinea

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Guinea
Conakry Region ⓘ Los Archipelago (Los Islands)	Biagioni, C., Merlino, S., Parodi, G. C., Perchiazzi, N. (2012) Crystal chemistry of minerals of the wöhlerite group from the Los Archipelago, Guinea. The Canadian Mineralogist, 50 (3) 593-609 doi:10.3749/canmin.50.3.593 Biagioni, C. (2007). I disilicati di Zr-Ti-Nb-REE delle sieniti a nefelina delle Iles de Los (Guinea). Tesi di laurea inedita, Università di Pisa. Moreau, C., Ohnenstetter, D., Demaiffe, D., & Robineau, B. (1996). The Los Archipelago nepheline syenite ring-structure Moreau, C., Ohnenstetter, D., Demaiffe, D., & Robineau, B. (1996). The Los Archipelago nepheline syenite ring-structure MOREAU, C., Robineau, B., Bah, M. S., & Camara, I. S. (1986). Caractères pétrographiques et géométriques d'une structure annulaire de syénites néphéliniques: l'archipel des Iles de Los (Guinée). Comptes rendus de l'Académie des sciences. Série 2, Mécanique, Physique, Chimie, Sciences de l'univers, Sciences de la Terre, 303(1), 71-74. Patterson, S., Kurtz, H., Olson, J., & Neeley, C. (1986). World bauxite resources, geology and resources of aluminium. US Geological Survey professional paper 1076-B. KUZNETSOVA, S., & ZAGRYAZHSKAYA, G. (1983). Sulfur isotope and geochemical data on the crystallization conditions of the feldspathoid syenites in the Loss massif, Guinea. Geochemistry international, 20(2), 64-75. LAZARENKOV, V. (1975). CHEMICAL COMPOSITION OF THE LOS PLUTON, REPUBLIC OF GUINEA. Doklady of the Academy of Sciences, USSR, 224, 199-201. Millot, G., & Bonifas, M. (1955). Transformations isovolumétriques dans les phénomènes de latéritisation et de bauxitisation. Sciences Géologiques, bulletins et mémoires, 8(1), 3-20. https://www.persee.fr/doc/sgeol_0037-2560_1955_num_8_1_1145 a magmatic marker of the evolution of the Central and Equatorial Atlantic. The Canadian Mineralogist, 34(2), 281-299.
ⓘ Rouma Island	Moreau, C., Ohnenstetter, D., Demaiffe, D., & Robineau, B. (1996). The Los Archipelago nepheline syenite ring-structure Lacroix, A. (1908) Sur l'existance du fluorure de sodium cristallisé comme èlèment des syènites nèphèliniques des îles de Los. Comptes Rendus Hebdomadaires des Séances de l'Académie des Sciences, 146 (5): 213-216 a magmatic marker of the evolution of the Central and Equatorial Atlantic. The Canadian Mineralogist, 34(2), 281-299.