Where to Find Allophane in the United States
2 mapped allophane spots across 2 U.S. states. Allophane 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 allophane across the United States, with 2 mapped spots
Top states for allophane
States ranked by number of allophane spots in our database. States in bold link to a focused allophane-in-state list.
Every allophane spot we track
Sorted by state and county. Coordinates open in Google Maps.
| Spot | County | Minerals | Coordinates | Access |
|---|---|---|---|---|
| Specimen Mountain | Larimer County | 40.4428, -105.8084 | Public | |
| SteelvilleStoney Ridge Lane | Crawford County | 38.0247, -91.2273 | Public |
Allophane rockhounding FAQ
Where is the best place to find allophane in the U.S.?+
Colorado, Missouri have the highest concentrations of allophane in this list. Each state's quality and access varies — open the linked state pages for a detailed view.
How many allophane rockhounding spots does RockHoundR track?+
2 mapped spots across 2 states. The app keeps these on a map alongside your private finds.
Can I legally collect allophane on public land?+
Casual hand collecting of common rocks and minerals like allophane 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 allophane in the field?+
Field identification of allophane 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 allophane on the map
Open RockHoundR to see these spots on a real map with public land overlays and trip-planning details.
