Where to Find Prehnite
37 mapped prehnite spots across 12 regions in 2 countries. Pick a region for its local guide, or browse every spot below. Prehnite is reported at multiple rockhounding spots across the United States. The map below shows where collectors most often find it on legal public ground.
Every mapped prehnite spot
Best spotCornwallLebanon County, PennsylvaniaPublic access · Actinolite, Andradite, Calcite +10
Best spotNear Saxon FallsIron County, WisconsinPublic access · Calcite, Chlorite, Epidote +3
Best spotNahantEssex County, MassachusettsPermission required · Jasper, Epidote, Prehnite +2
Best spotLoudon CountyLoudoun County, VirginiaPublic access · Calcite, Datolite, Epidote +6
AltaSalt Lake County, UtahPublic access · Apatite, Biotite, Barite +14- Pompton LakesPassaic County, New JerseyPublic access · Banded Agate, Amethyst, Barite +12
- Prospect Park QuarryPassaic County, New JerseyPublic access · Banded Agate, Amethyst, Barite +12
- Santaquin & Silver Lake mining districtsUtah County, UtahPublic access · Actinolite, Andradite, Argentite +9
- Bound BrookSomerset County, New JerseyPublic access · Agate, Bornite, Calcite +8
McClain State ParkHoughton County, MichiganPermission required · Adularia, Chalcedony, Chert +8- PerryWashington County, MainePublic access · Analcime, Calcite, Datolite +8
- East Granby QuarryCapitol Planning Region, ConnecticutPublic access · Datolite, Aragonite, Calcite +6
- Rock Hill QuarrySomerset County, New JerseyPublic access · Albite, Chalcocite, Chrysocolla +6
- Bon Ami PointRestigouche County, New BrunswickCheck locally · Chalcedony, Jasper, Prehnite +5
- Calumet Waterworks ParkHoughton County, MichiganCheck locally · Lake Superior Agate, Prehnite, Natrolite +5
- Cliff NorthKeweenaw County, MichiganCheck locally · Copper, Calcite, Chlorite +5
- Gratiot River County ParkKeweenaw County, MichiganPublic access · Freda Sandstone, Basalt, Rhyolite +5
- Cliff MineKeweenaw County, MichiganCheck locally · Copper, Calcite, Chlorite +4
- High Rock BayKeweenaw County, MichiganPublic access · Prehnite, Calcite, Copper +4
- Mt. GilboaHunterdon County, New JerseyPublic access · Axinite, Prehnite, Epidote +4
- Clarke HeadCumberland County, Nova ScotiaPermission required · Quartz, Analcime, Prehnite +3
- HopewellSomerset County, New JerseyPublic access · Calcite, Stilbite, Prehnite +3
- HerbsterBayfield County, WisconsinPublic access · Granite, Agate, Banded Iron Formation +2
- Port Wing MarinaBayfield County, WisconsinPublic access · Granite, Agate, Banded Iron Formation +2
- Reefer Creek Rest AreaBayfield County, WisconsinPublic access · Granite, Agate, Banded Iron Formation +2
- Esrey ParkKeweenaw County, MichiganPublic access · Granite, Prehnite, Copper +1
- Jeffrey MineLes Sources, QuébecCheck locally · Grossular Garnet, Vesuvianite, Prehnite +1
- Keweenaw Rocket RangeKeweenaw County, MichiganPublic access · Granite, Prehnite, Copper +1
- Houdaille QuarryUnion County, New JerseyPublic access · Agate, Prehnite, Amethyst
- KingstonSomerset County, New JerseyPublic access · Agate, Prehnite, Quartz
- Lane QuarryHampden County, MassachusettsPublic access · Amethyst, Datolite, Prehnite
- Lane Trap Rock QuarryHampshire County, MassachusettsPublic access · Amethyst, Prehnite, Datolite
- Pine Rock QuarrySouth Central Connecticut Planning Region, ConnecticutPublic access · Prehnite, Calcite, Serpentine
- Seneca No. 1 ShaftKeweenaw County, MichiganPermission required · Copper, Datolite, Prehnite
- FarmingtonCapitol Planning Region, ConnecticutPublic access · Agate, Prehnite
- TorringtonNorthwest Hills Planning Region, ConnecticutPublic access · Agate, Prehnite
- Morris CountyMorris County, New JerseyPublic access · Prehnite
Top regions for prehnite
United States
34 spots · 9 regionsCanada
3 spots · 3 regionsPrehnite rockhounding FAQ
Where is the best place to find prehnite?+
Michigan, New Jersey, Connecticut have the highest concentrations of prehnite in this list. Quality and access vary by area, so open the linked region pages for a detailed view.
How many prehnite rockhounding spots does RockHoundR track?+
37 mapped spots across 12 regions in 2 countries. The app keeps these on a map alongside your private finds.
Can I legally collect prehnite on public land?+
In the U.S., casual hand collecting of common rocks and minerals like prehnite 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. Rules differ by country and region, so always check with the managing agency before a trip.
How do I identify prehnite in the field?+
Field identification of prehnite 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 prehnite on the map
Open RockHoundR to see these spots on a real map with public land overlays and trip-planning details.
