JOIN US for the Contra Costa Mineral & Gem Society’s 75th ANNIVERSARY MINERAL & GEM SHOW November 8-9, 2025! Come enjoy a rockin’ weekend full of affordable family FUN, holiday shopping, and educational experiences for ALL AGES! Come celebrate 75 years with us, and see what is NEW this year! Vendors, Minerals, Gems, Fossils, Meteorites, Jewelry, Beads, Slabs, Displays, Fluorescent Tent, Demonstrations, Family Activities, Games, Rock Painting, Door Prizes, Silent Auctions, Raffles, plus SO much more... Enjoy FREE PARKING and FREE Sunday admission WITH PAID Saturday! Admission: 13 & Over $10. 12 & Under FREE. First Responders/Scouts/Youth Org. Members in Uniform FREE.