Field Guide — Rocks, Minerals & Regional Geology | Geo-Gem
Regional rockhounding guides covering geology, common specimens, best collecting sites, and field identification tips for locations across North America and beyond.
Regional Guides
Each regional field guide covers the local geology, lists the rocks and minerals most commonly found there, describes the best collecting sites and access conditions, and provides field identification tips specific to that area. Regions include states, provinces, national parks, and geological formations.
Species Identification Wizard
Not sure what you found? Use the field guide identification wizard to narrow down possibilities by entering observable properties — color, texture, luster, hardness, and more — and get a ranked list of matching rock and mineral species.
Personal Life List
Bookmark species you want to find and mark off the ones you've already collected. Your personal field guide tracks your progress across every region and rock type.
Explore Geo-Gem
- AI Rock & Mineral Identification — snap a photo and get an instant AI-powered ID
- Community Discoveries — browse finds from rockhounds around the world
- Field Guide — regional guides to rocks, minerals, and geology
- Rock & Mineral Database — comprehensive identification reference
- Marketplace — buy and sell specimens with verified collectors
- Rockhound Groups — join local clubs and online communities
- Events & Field Trips — upcoming geology events near you
- Leaderboard — top contributors in the community