Where to Find Tephroite in the United States
2 mapped tephroite spots across 2 U.S. states. Tephroite 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 tephroite across the United States, with 2 mapped spots
Top states for tephroite
States ranked by number of tephroite spots in our database. States in bold link to a focused tephroite-in-state list.
Every tephroite spot we track
Sorted by state and county. Coordinates open in Google Maps.
| Spot | County | Minerals | Coordinates | Access |
|---|---|---|---|---|
| Alum Rock ParkPenitencia Creek Trail | Santa Clara County |
| 37.3958, -121.8019 | Public |
| Franklin FurnaceBuckwheat Road | Sussex County | 41.1163, -74.5873 | Public |
Tephroite rockhounding FAQ
Where is the best place to find tephroite in the U.S.?+
California, New Jersey have the highest concentrations of tephroite in this list. Each state's quality and access varies — open the linked state pages for a detailed view.
How many tephroite 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 tephroite on public land?+
Casual hand collecting of common rocks and minerals like tephroite 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 tephroite in the field?+
Field identification of tephroite 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 tephroite on the map
Open RockHoundR to see these spots on a real map with public land overlays and trip-planning details.
