RockWoofFound alongside
Mica
Mohs 2–3. Peels into thin, flexible, shiny sheets. Mindat
60 sites
Quartz
Mohs 7. Six-sided points; smoky quartz is NH’s state gem. Mindat
32 sites
Pyrite
Mohs 6–6.5. Brassy “fool’s gold,” often cubic. Mindat
27 sites
Feldspar
Mohs 6–6.5. Blocky crystals with flat cleavage faces. Mindat
21 sites
Garnet
Mohs 6.5–7.5. Usually deep red, round many-faced crystals. Mindat
18 sites
Magnetite
Mohs 5.5–6.5. Black and strongly magnetic. Mindat
11 sites
Counts are sites whose USGS record mentions the mineral or commodity. Hardness from Mindat.
By county
Essex County (15) · Warren County (11) · St. Lawrence County (11) · Putnam County (5) · Washington County (4) · Saratoga County (4) · Lewis County (2) · Clinton County (2) · Orange County (2) · Jefferson County (1) · Dutchess County (1) · Greene County (1) · Rockland County (1)
Sites
| Site | Commodity | Minerals recorded | Status | Approx. location |
|---|---|---|---|---|
| Crown Point Spar Mine | Feldspar | Biotite, Feldspar | Past Producer | 43.924, -73.438 |
| Corinth Feldspar Co. Quarry | Feldspar | Biotite, Feldspar, Garnet, Quartz | Occurrence | 43.237, -73.871 |
| Unnamed Occurrence | Garnet | Biotite, Feldspar, Garnet, Quartz | Occurrence | 43.738, -73.981 |
| American Mine | Graphite | Biotite, Feldspar, Graphite, Pyrite | Past Producer | 43.751, -73.573 |
| The Bly Property Mine | Graphite | Biotite, Feldspar, Graphite, Pyrite, Quartz | Occurrence | 43.862, -73.586 |
| Chestertown Occurrence | Mica | Biotite, Feldspar, Muscovite, Quartz | Past Producer | 43.615, -73.780 |
| Roe Mine | Feldspar | Biotite, Feldspar, Pyrite | Past Producer | 43.982, -73.540 |
| Croton - Theall Magnetite Mine | Iron | Chalcopyrite, Magnetite, Pyrite | Past Producer | 41.368, -73.651 |
| Croton-Mc Collum Magnetite Mine | Iron | Chalcopyrite, Magnetite, Pyrite | Past Producer | 41.365, -73.654 |
| International Graphite Co. Property | Graphite | Feldspar, Graphite, Mica, Pyrite, Quartz | Past Producer | 43.757, -73.877 |
| Adirondack Mining and Milling Co Mine | Graphite | Feldspar, Mica | Past Producer | 43.553, -73.472 |
| Rose Rock Quarry | Feldspar | Feldspar, Mica, Pyrite | Past Producer | 43.920, -73.453 |
| Unnamed Occurrence | Granite, Quartz | Granite, Mica, Quartz | Occurrence | 43.745, -73.963 |
| Lakeside Mine | Graphite | Graphite | Past Producer | 43.752, -73.494 |
| Champlain Graphite Co. Mine | Graphite | Graphite | Past Producer | 43.547, -73.469 |
| Potterville Prospect | Graphite | Graphite, Phlogopite, Pyrite | Occurrence | 43.692, -73.826 |
| Empire Graphite Mine | Graphite | Graphite, Pyrite | Past Producer | 43.140, -73.928 |
| Graphite Products Corp. | Graphite | Graphite, Pyrite | Past Producer | 43.141, -73.786 |
| Rock Pond Deposit | Graphite | Graphite, Pyrite | Past Producer | 43.855, -73.591 |
| Bly Property | Graphite | Graphite, Pyrite | Past Producer | 43.862, -73.590 |
| Faxon Property | Graphite | Graphite, Pyrite | Occurrence | 43.743, -73.590 |
| Dixon's American Graphite Co. Mine | Graphite | Graphite, Pyrite | Past Producer | 43.751, -73.580 |
| Hooper Bros. Mine | Graphite | Graphite, Pyrite | Past Producer | 43.561, -73.488 |
| Benson Mine and Mill | Iron | Hematite, Magnetite | Past Producer | 44.179, -75.006 |
| Maltby Limonite Mine | Iron | Limonite | Past Producer | 41.970, -73.497 |
| Deerlick Rapids Occurrence | Iron | Magnetite | Occurrence | 44.285, -74.882 |
| Sanford Hill Body | Iron, Titanium, Metal | Magnetite | Past Producer | 44.055, -74.049 |
| Mahopac Magnetite Mine | Iron | Magnetite | Past Producer | 41.396, -73.750 |
| Unnamed Magnetite Mine Dep. No. 17 | Iron | Magnetite | Past Producer | 41.486, -73.817 |
| Pyrites Prospect | Sulfur-Pyrite | Pyrite | Past Producer | 44.517, -75.197 |
| Mitchell Prospect | Sulfur-Pyrite, Iron, Pig Iron | Pyrite | Occurrence | 44.443, -75.327 |
| Port Leyden Mine | Titanium, Metal, Iron | — | Occurrence | 43.583, -75.333 |
| Mitchell Prospect | Iron | — | Occurrence | 44.527, -73.652 |
| White Crystal Dolomite Deposits | Marble, Dimension | — | Past Producer | 44.380, -75.470 |
| Whitney Marble Quarry | Marble, Dimension | — | Past Producer | 44.303, -75.492 |
| Arnold Mine | Talc-Soapstone | — | Past Producer | 44.272, -75.384 |
| Split Rock Mine | Iron | — | Past Producer | 44.240, -73.363 |
| Battie Mine | Iron | — | Past Producer | 44.504, -73.584 |
| Unnamed Prospect | Mica | — | Occurrence | 44.324, -73.715 |
| Smith Prospect | Graphite | — | Occurrence | 44.408, -73.563 |
| Spruce Mountain Northwest Occurrence | Iron | — | Occurrence | 44.254, -75.002 |
| Trembley Mountain Occurrence | Iron | — | Occurrence | 44.213, -74.912 |
| Oxbow Southwest Prospect | Sulfur-Pyrite | — | Occurrence | 44.265, -75.642 |
| Parishville Deposit | Iron | — | Past Producer | 44.634, -74.790 |
| Batchellerville Beryl Mine | Beryllium | — | Past Producer | 43.233, -74.050 |
| Chestertown Prospect | Mica | — | Prospect | 43.616, -73.781 |
| George Guidone Property Deposit | Mica | — | Occurrence | 42.329, -74.010 |
| Macintyre Development | Iron, Titanium | — | Past Producer | 44.051, -74.050 |
| Erwin Ackerman Property Deposit | Mica | — | Prospect | 44.158, -75.408 |
| Mineville Mines | Iron | — | Past Producer | 44.060, -73.460 |
| Barrett Manufacturing Co. Quarry | Feldspar | — | Past Producer | 43.863, -73.456 |
| Arden Mica Deposit | Mica | — | Occurrence | 41.274, -74.142 |
| Lake Winade Mica Mine | Mica | — | Past Producer | 41.283, -74.193 |
| Croton Magnetite Iron Mines | — | — | Past Producer | 41.367, -73.653 |
| John Wells Mica Property Deposit | Mica | — | Prospect | 44.281, -73.806 |
| Adirondack Park | Aluminum | — | Occurrence | 44.114, -73.862 |
| Benson Mines | Iron | — | Past Producer | 44.179, -75.006 |
| Rose Haupt Property Deposit | Mica | — | Prospect | 43.167, -73.866 |
| Peter Wyant Mica Property Deposit | Mica | — | Prospect | 41.294, -74.022 |
| Willis Brown Property Deposit | Feldspar | — | Prospect | 43.633, -73.783 |
Back to Rockhounding in New York.
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