RockWoofFound alongside
Quartz
Mohs 7. Six-sided points; smoky quartz is NH’s state gem. Mindat
19 sites
Magnetite
Mohs 5.5–6.5. Black and strongly magnetic. Mindat
17 sites
Pyrite
Mohs 6–6.5. Brassy “fool’s gold,” often cubic. Mindat
7 sites
Mica
Mohs 2–3. Peels into thin, flexible, shiny sheets. Mindat
6 sites
Feldspar
Mohs 6–6.5. Blocky crystals with flat cleavage faces. Mindat
4 sites
Garnet
Mohs 6.5–7.5. Usually deep red, round many-faced crystals. Mindat
1 site
Counts are sites whose USGS record mentions the mineral or commodity. Hardness from Mindat.
By county
Morris County (9) · Warren County (7) · Sussex County (2) · Ocean County (1)
Sites
| Site | Commodity | Minerals recorded | Status | Approx. location |
|---|---|---|---|---|
| Broadway Mine | Iron | Limonite | Past Producer | 40.735, -75.021 |
| Roseville Mine | Iron | Magnetite | Past Producer | 40.969, -74.698 |
| Beach Glen Mine | Iron | Magnetite | Past Producer | 40.935, -74.483 |
| Bald Pate Mine | Iron | Magnetite | Past Producer | 40.816, -74.907 |
| Excelsior Mine | Iron | Magnetite | Past Producer | 40.886, -74.808 |
| Bryant Mine | Iron | Magnetite | Past Producer | 40.894, -74.806 |
| Wood Hull Mine | Iron | Magnetite | Past Producer | 40.776, -74.695 |
| Marsh Mine | Iron | Magnetite | Past Producer | 40.811, -74.816 |
| Smith Mine | Iron | Magnetite | Past Producer | 40.873, -74.802 |
| Birch Mine | Iron | Magnetite | Past Producer | 40.964, -74.480 |
| Hibernia Mine | Iron | Magnetite | Past Producer | 40.951, -74.487 |
| Terry Mine | Iron | Magnetite | Past Producer | 40.694, -75.057 |
| Green Pond Mines | Iron | Magnetite | Past Producer | 41.008, -74.468 |
| Meadow Mine | Iron | Magnetite | Past Producer | 40.901, -74.567 |
| McKean Mine | Iron | Magnetite | Past Producer | 40.960, -74.724 |
| Daniel Horton Mine | Iron | Magnetite | Past Producer | 40.813, -74.652 |
| Waterloo Mine | Iron | Magnetite | Past Producer | 40.910, -74.795 |
| Pahaquarry Copper Mine | — | — | Past Producer | 41.028, -75.035 |
| Manchester Unit & Plant | Titanium | — | Past Producer | 39.985, -74.345 |
Back to Rockhounding in New Jersey.
How we built this page: we counted named sites in the USGS Mineral Resources Data System (MRDS) for this area, left out sand, gravel, crushed stone, clay pits and unnamed sites, grouped them by Census county, and linked every site to its USGS record. We did not visit these sites, and MRDS does not tell you who owns the land or whether collecting is allowed.
Source: USGS Mineral Resources Data System (MRDS). USGS ceased systematic updates to MRDS around 2011, so status and details may be out of date. Each site links to its USGS record.
Updated