Geology
- 401
- Livermore Valley Lithophiles Gem and Mineral Society
- "Lithophiles" are rock lovers and this club serves the Livermore California area with monthly meetings, field trips, educational programs, and an annual show "Lithorama".
- 402
- Middle Tennessee Rockhounds
- Group of individuals who share common interests in collecting and working with gems, minerals, jewelry, geology, and fossils.
- 403
- Mineral and Gem Society of Castro Valley
- This California society was established since 1945 to exchange information, teach others, promote field trips, and to provide a club workshop for the lapidary arts.
- 404
- Montreal Gem and Mineral Club
- Non-profit organization with workshops, field trips, shows and related links.
- 405
- North Jeffco Gem and Mineral Club, Arvada, Colorado
- Purpose is to promote the Earth Sciences through programs at our monthly meetings. Members enjoy rockhounding (rocks, minerals and fossils).
- 406
- San Francisco Gem and Mineral Society
- This California society has monthly meetings, and a newsletter to promote the lapidary arts.
- 407
- Santa Clara Valley Gem and Mineral Society
- This club centered in the south end of the San Francisco bay, features online copies of monthly newsletters, that highlight the monthly meetings, speakers, field trips, study groups, and a yearly "Rock and Gem" show.
- 408
- Santa Cruz Mineral and Gem Society
- This California society was organized 1949, to promote the study and collecting of minerals and gemstones, with monthly meetings, a newsletter, field trips, a rock shop, and an annual show.
- 410
- South Bay Lapidary and Mineral Society
- The Torrance, California society with monthly meetings and field trips for rockhounds, lapidary enthusiasts, and those interested in geology.
- 411
- Tuscarora Lapidary Society's Gemarama
- Tuscarora Lapidary Society, a club outside of Philadelphia, PA offers classes in the lapidary skills. The club also hosts a large annual gem show with exhibits, dealers, and demonstrations.
- 412
- Mineralogical Society of America
- MSA Online: New Interactive Content and Programming offered by the Mineralogical Society of America.
- 413
- California Federation of Mineralogical Societies
- A federation of California (and a few in Arizona, Nevada, and Hawaii) gem and mineral societies, with on-line monthly newsletters, links to member societies and current rockhound topics.
- 414
- Midwest Federation of Mineralogical & Geological Societies
- covering the Midwestern states of Illinois, Indiana, Iowa, Michigan, Minnesota, Missouri, Ohio, and Wisconsin, the western parts of North and South Dakota, and Nebraska, and parts of Arkansas. The federation has a monthly newsletter, and maintains a calendar of events of member society shows.
- 415
- Rocky Mountain Federation of Mineralogical Societies
- Regional federation of amateur enthusiasts in gems, minerals, fossils and the lapidary arts covering Arizona, Arkansas, Colorado, Kansas, Nebraska, New Mexico, North Dakota, Oklahoma, South Dakota, Texas, Utah and Wyoming.
- 416
- South Central Federation of Mineral Societies
- a federation of over 40 clubs and societies covering Arkansas, Louisiana and Texas; organized since 1943
- 417
- The Australian Mineral Collector
- an informal collection of six Australian mineralogical societies not connected by any formal constitution or agreement, the societies form a loose union which bonds their members together by common ideals and interests.