Alessandro Da MommioAlessandro Da Mommio is a mathematics and science teacher at the Istituto Salesiano S. Ambrogio, a high school in Milan. He completed his Ph.D. in geology at the University of Milan in 2015. He has maintained a passion for petrography since his underraduate days, and for many years has built an outstanding website dedicated to the petrography of minerals and rocks. One of his images was placed second in the 2014 Photomicrography Competition. Read More Read Less