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Contra Costa Mineral & Gem Society

Club with field trips for members

Based in Concord, California.

ccmgsclub.com ↗facebook.com ↗

Email:

Mineral and gem society founded in 1950. Meets on the second Monday of each month at 7 PM (doors open about 30 minutes earlier; a picnic instead of the meeting in June) at Centre Concord, 5298 Clayton Road, Concord. Members-only field trips (Mount Diablo jaspers, Mariposa garnet and staurolite, mariposite in October 2026, Nevada opal mines), and the annual Mineral & Gem Show at Centre Concord every November (the 76th in 2026).

meetup.com ↗

Around here, the land is mostly private

Within 50 miles of Concord our maps show no open public land to prospect. That is exactly why a club matters here: clubs have the landowner permissions, the leases and the know-how.

Nearest open public land on our gem and mineral map: about 68 miles away.

Nearest open public land on our fossil and meteorite map: about 183 miles away.

See the nearest open land on the gem and mineral map →See the nearest open land on the fossil and meteorite map →

Prospecting and collecting rules in the US →

Other clubs and places nearby