COOLIDGE — A “gem in the desert” offers residents and visitors alike a space to learn, collect specimens and enjoy earth sciences. Pinal Geology & Mineral Museum opened in 2015 in Coolidge thanks to Raymond Grant, who founded it at 351 N. Arizona Blvd. Its summer hours are Friday to Saturday from 10 a.m. to 4 p.m., returning to winter hours in September from Wednesday to Saturday at that same time.