Serving Contra Costa County
of Northern California Since 1950
ABOUT THE CONTRA COSTA MINERAL & GEM SOCIETY
WELCOME TO THE CONTRA COSTA MINERAL & GEM SOCIETY
The Contra Costa Mineral & Gem Society is a 501(c)(3) nonprofit organization that is dedicated to supporting geology, gemology, and mineralogy hobby collecting through the promotion of recreational and educational experiences such as prospecting, mining, and the use of public and private lands to our members.
Our organization’s mission is to promote popular interest and education in the earth sciences, including geology, mineralogy, paleontology, lapidary arts, and other related subjects. We strive to foster fellowship among individuals, groups, and associations with similar interests across our local community and beyond.
CLUB MEETINGS ARE THE SECOND MONDAY EVERY MONTH AT 7PM (SEE CALENDAR FOR ALL DETAILS) - VISITORS ARE WELCOME!
Thanks for 75 rockin' years.
The Contra Costa Mineral & Gem Society is honored to announce 2025 as its 75th year in service towards our mission. We look forward to sharing all that is in store for our Membership this year. Join or renew now to join us in 2025!
WELCOME TO CCMGS
Learn more about the Contra Costa Mineral & Gem Society's mission, club history, and current board of directors.
JOIN OUR CLUB
Great for families and all ages, we welcome you to join our club! Learn more about the benefits of membership today and apply.
LEARN ABOUT ROCKS
Learn more about the rockin' world of geology and mineralogy through our many informative resources and fun events.
GET OUT AND GO
Join the CCMGS on local field trips to collection sites, and even on out-of-state trips to explore geology through first hand experience.
VISIT US AT OUR SHOW
Come browse and add to your collections during our annual show in November. See our calendar to get ready for what's coming!
CREATE KEEPSAKES
Create your own keepsakes to treasure forever from gemstones you've collected while a member! Learn more about our activities.
Serving Contra Costa County
of Northern California Since 1950
SEE WHAT'S NEXT ON THE CALENDAR AT CCMGS
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