Where to Find Biotite in the United States
31 mapped biotite spots across 12 U.S. states. Biotite is reported at multiple rockhounding spots across the United States. The map below shows where collectors most often find it on legal public ground.
Map showing where to find biotite across the United States, with 31 mapped spots
Top states for biotite
States ranked by number of biotite spots in our database. States in bold link to a focused biotite-in-state list.
Every biotite spot we track
Sorted by state and county. Coordinates open in Google Maps.
Biotite rockhounding FAQ
Where is the best place to find biotite in the U.S.?+
Utah, Maine, Georgia have the highest concentrations of biotite in this list. Each state's quality and access varies — open the linked state pages for a detailed view.
How many biotite rockhounding spots does RockHoundR track?+
31 mapped spots across 12 states. The app keeps these on a map alongside your private finds.
Can I legally collect biotite on public land?+
Casual hand collecting of common rocks and minerals like biotite is allowed on most BLM and U.S. Forest Service land, with daily and annual limits set by the local field office. National parks, most state parks, and tribal land are off-limits. Always check with the managing agency before a trip.
How do I identify biotite in the field?+
Field identification of biotite comes down to color, hardness, fracture, and luster. The RockHoundR app links to geology details for each spot to help narrow down what you might be picking up.
Hunt biotite on the map
Open RockHoundR to see these spots on a real map with public land overlays and trip-planning details.
