Genesis of analcime and nepheline-potassiumfeldspar-kalsilite intergrowths: a review - Comin-Chiaramonti, P.; Cundari, Aldo; Ruberti, Excelso; De Min, Angelo; Gittins, J.; Gomes, Celso B.; Gwalani, Lalchand (Acta vulcanologica, 2009)