United States (美国)

The United States is one of the world's most mineralogically diverse countries, with collector localities spanning every major geological terrane. American mineralogy traces a 19th-century lineage through Franklin/Sterling Hill (New Jersey) — the world's most species-rich locality — and continues through 20th-century gem and ore-mineral discoveries that have established multiple American type localities.

Major U.S. collector regions include: Franklin and Sterling Hill, New Jersey (willemite, franklinite, zincite, hardystonite — 350+ species, the world's most fluorescent locality); Cripple Creek, Colorado (calaverite, sylvanite — type-quality American Au-tellurides); Sweet Home Mine, Colorado (gem rhodochrosite — the species' modern definition); Bisbee, Arizona (azurite-malachite secondary copper mineralogy); Magnet Cove, Arkansas (brookite, schorlomite, perovskite); Searles Lake and Boron, California (hanksite, kernite, colemanite, ulexite — world borate evaporite sources); Benitoite Gem Mine, California (the type and only commercial source of benitoite); and Tri-State Mining District, Missouri-Kansas-Oklahoma (Joplin galena cubes, ruby jack sphalerite).

American specimens are particularly important in the historical-collector market: 19th-century Franklin pieces, Sweet Home rhodochrosite from the Alma King and successor pockets, and old Bisbee azurite from the Copper Queen workings carry premium provenance value.