Encouraged by one of his schoolteachers , he would make trips to see the mineral collection at the Field Museum of Natural History .
Mandarino 's interest in minerals began when he was a child , collecting rocks around the Chicago area .
Encouraged by one of child 's schoolteachers , child would make trips to see the mineral collection at the Field Museum of Natural History .
Mandarino 's interest in minerals began when he was a child , collecting rocks around the Chicago area .