Contra Costa Mineral & Gem Society

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Concord, CA
Contra Costa Mineral & Gem Society

Contact information, map and directions, contact form, opening hours, services, ratings, photos, videos and announcements from Contra Costa Mineral & Gem Society, Nonprofit Organization, P. O. BOX 842, Concord, CA.

The Contra Costa Mineral & Gem Society is a 501(c)(3) nonprofit organization that is dedicated to supporting geology, gemology, and mineralogy hobby collecting in our community through the promotion of recreational and educational experiences.

11/02/2025

✨ NEXT WEEKEND! 75th Anniversary Mineral & Gem Show!

🎟️ Admission:
Seniors over 65 | $9
13 & over | $10
12 & under | FREE
Free Sunday w/ Paid Proof of Saturday Entry
Enjoy Free Parking!

📍Location:
Centre Concord
5298 Clayton Rd., Concord, CA 94521

🕒 Dates & Times:
Sat. Nov. 8, 10AM–5PM
Sun. Nov. 9, 10AM–4PM

✨ Learn more & get tickets NOW at www.ccmgsclub.com/show!

09/13/2025

"The Best place to Rockhound is in A Rockhound's back yard!"

BACKYARD ROCK SALE this weekend September 13, 2025. Everything MUST GO!

A large inventory of rocks collected through years of rockhounding! Obsidians, Quartz, Jaspers, Chrysacolla, Jades, Agates, Petrified Wood including Arizona Petrified wood and more.

A Workshop FULL of Equipment, and tools for woodworking, metal work, carving, stone figurines, novelty items, fossils, polished agates, thunder eggs, colorful beads and more.

There are rocks to sell by the pound $1 or get Rocks by the box! BYO bucket get Rocks by the bucket ALL w/BO deals!! Holiday shopping ROCKS!

Purchase Rocks in Bulk - make us an offer, price negotiable.
EVERYTHING MUST GO! FINAL SALE

Location: 14 Creekwood Ct. in Danville
When: Saturday September 13th 2025 9am-2pm

05/18/2025

CATCH US AT KIDFEST! 🤩 The CCMGS will be hosting a booth THIS Memorial 3-Day Weekend at the Toyota Pavilion At Concord ☀️ Stop by our booth for GIVEAWAYS, GAMES, and PRIZES! 🎁 There will be FUN for ALL AGES! We'll see you there! 🎉

01/13/2025

🤣 'MUSEMENT MONDAYS 🤣 Follow Our Page For Weekly Jokes!

01/11/2025

Did you win anything from the Silent Auction we held at our 2024 annual Mineral & Gem Show? Don't worry if you didn't! We hold an annual auction every year around Fall. Stay tuned for announcements on our 2025 Auction coming up this year! 😀

01/10/2025

HAPPY NEW YEAR! If you are a CURRENT member that needs to RENEW for 2025, we now offer the option online on our website at www.ccmgsclub.com/membership 😄 NEW members are also welcome to join at any time during the year using our website or by coming to one of our meetings! 👍

01/08/2025

Thanks again for everyone's support at our 2024 Annual mineral & Gem Show. Now that we are in the new year, we are beginning to start our search for our 2025 sponsors, vendors, and demonstrators. Please reach out to [email protected] to stay in the know about this year's opportunities. 👍

01/07/2025

We hope everyone loved the new Treasure Hunt activity we had at our 2024 Annual Show as much as we did! See more photos from our events on our website at www.ccmgsclub.com/gallery 😀👍

01/06/2025

🤣 'MUSEMENT MONDAYS 🤣 Follow Our Page For Weekly Jokes!

01/05/2025

Rock painting at our 2024 Annual Mineral & Gem Show was a hit! Thank you to our sponsor, Statefarm, for support with this activity! 👍

Address

P. O. BOX 842
Concord, CA
94522

Website

https://www.ccmgsclub.com/

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