Fig. 1
From: Quantitative determination of the mineral content of settleable particulate matter samples

Diffractograms made on a flat glass support: (a) particulate matter collected at the Mestre Caballero school (Onda, NE Spain); (b) particulate matter collected at town hall of L’Alcora (NE Spain). FG or G—Enriched fraction in large-size particles, FM or M—Enriched fraction in intermediate-sized particle and FF or F—Enriched fraction in small-size particles.