Fig. 4From: Compositional and structural analysis of engineered stones and inorganic particles in silicotic nodules of exposed workersImages of the countertops analyzed, the drill bit used, and the powder extracted and 4 XRD diagrams for 4 of the samples. Among them, the major crystalline phases of SiO2, i.e., quartz (Qu) and cristobalite (Cri), were detected, as well as minerals containing Na (AlSi3O8), i.e., albite (Alb). In the sample M4, approximately 2% of crystals (other) comprised 0.7% SiO2 tridymite, 0.4% TiO2 rutile, 0.35% Pb4BiVO8, and 0.2% intermetallic Sn3Ti5Back to article page