Quartz and Quartzite lithic raw material studies: problems and challenges - Abrunhosa, Ana; Santonja, Manuel; Pérez-González, Alfredo; Panera Gallego, Joaquín; Méndez Quintas, Eduardo; Rubio Jara, Susana; Aubry, Thierry; Anjos Ribeiro, Maria dos; Dimuccio, Luca A. (2022)