Identification of New Geochemical Groups in Obsidian Artifacts from Aluminé (Neuquén, Argentina) Using Nondestructive Analysis (pXRF). In this paper we present the results obtained from the analysis of 49 obsidian samples by non-destructive portable X-ray fluorescence (pXRF) in sites and isolated finds from Aluminé, northwestern Patagonia, Argentina. Being non-destructive techniques, the analysis of fragmented and complete instruments was incorporated, observing as a result an 80% increase in the representation of geochemical groups with respect to what was previously identified by means of other destructive techniques. We confirm the presence of the geochemical groups PC1 (Portada Covunco) and NS (Nevados de Sollipulli) of transcordilleran origin. We also present the novel evidence of raw materials circulating along the north-south axis, so far absent in Aluminé, through the record of the geochemical groups CB2 (Cerro Bayo 2), together with Hn (Huenul) and CP-LL1 (Cerro Las Planicies-Lago Lolog). These groups come from sources located respectively to the north and south of Aluminé; in some cases, possibly circulating as raw material, and in others as manufactured products in the form of projectile points, where the possible selection of chromatic variants is observed.