RockWoofFound alongside
Garnet
Mohs 6.5–7.5. Usually deep red, round many-faced crystals. Mindat
13 sites
Magnetite
Mohs 5.5–6.5. Black and strongly magnetic. Mindat
11 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
3 sites
Tourmaline
Mohs 7–7.5. Long striated crystals, often black (schorl) or green and pink (elbaite). Mindat
2 sites
Feldspar
Mohs 6–6.5. Blocky crystals with flat cleavage faces. Mindat
2 sites
Counts are sites whose USGS record mentions the mineral or commodity. Hardness from Mindat.
By county
Warren County (8) · Sussex County (2) · Morris County (1) · Ocean County (1) · Hunterdon County (1)
Sites
| Site | Commodity | Minerals recorded | Status | Approx. location |
|---|---|---|---|---|
| Broadway Mine | Iron | Limonite | Past Producer | 40.735, -75.021 |
| Huff Mine | Iron | Magnetite | Past Producer | 40.901, -74.567 |
| Kaiser Mine | Iron | Magnetite | Past Producer | 40.812, -75.041 |
| Queen Mine | Iron | Magnetite | Past Producer | 40.814, -75.019 |
| Hoit Mine | Iron | Magnetite | Past Producer | 40.837, -74.967 |
| Staley Mine | Iron | Magnetite | Past Producer | 40.798, -74.995 |
| Stinson Mine | Iron | Magnetite | Past Producer | 40.908, -74.917 |
| Davis Mine | Iron | Magnetite | Past Producer | 40.919, -74.905 |
| Wintermute Mine | Iron | Magnetite | Past Producer | 40.892, -74.819 |
| Glendon Mine | Iron | Magnetite | Past Producer | 40.961, -74.763 |
| Emery Farm Exploration | Iron | Magnetite | Past Producer | 40.684, -74.868 |
| Silver Mine | Iron | Magnetite, Pyrite, Pyrrhotite | Past Producer | 40.942, -74.738 |
| Colliers Mills-Keswick Grove | Zirconium, Titanium, Metal | — | Occurrence | 40.067, -74.450 |
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 USGS ceased systematic updates to MRDS around 2011, so status and details may be out of date.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