Rockhounding in Herkimer County, New York
9 mapped rockhounding spots in Herkimer County. Most commonly produces herkimer diamond, quartz, calcite, epidote.
Herkimer County rockhounding photos
Representative spot and material photos from this county, shown where verified public image records are available.
Map showing 9 rockhounding spots in Herkimer County, New York
Minerals reported in Herkimer County
Standouts in Herkimer County
Hand-picked spots in Herkimer County, chosen for unusual mineralogy or documented public access. Each card opens the full coordinates and access notes.
Top pickAce of Diamonds & Herkimer Diamond Mine
PublicHerkimer County
The Ace of Diamonds and neighboring Herkimer Diamond Mine sit on the Cambrian Little Falls Dolostone, the type ground for the doubly-terminated clear quartz crystals known worldwide as Herkimer diamonds.
Herkimer Diamond
Top pickIlion Gorge
PublicHerkimer County
Ilion Gorge is New York's best known travertine locality, where spring deposits form banded orange and brown flowstone, botryoidal crusts, and small stalactites in the gorge walls.
Travertine
Spots in Herkimer County
| Spot | Minerals | Coordinates | Access |
|---|---|---|---|
| Ace of Diamonds & Herkimer Diamond Mine | 43.1315, -74.9741 | Public | |
| Ace of Diamonds MineNew York State Thruway | 43.0110, -74.9720 | Paid / fee | |
| Diamond Mountain MiningNY 5S | 43.0150, -74.8740 | Paid / fee | |
| General Area (Herkimer County 1)State Highway 28 | 43.1532, -74.9781 | Public | |
| General Area (Herkimer County 2)State Highway 29 | 43.1377, -74.9484 | Public | |
| General Area (Herkimer County 3) | 43.1112, -74.9947 | Public | |
| Herkimer Diamond Mines | 43.1292, -74.9763 | Paid / fee | |
| Ilion GorgeJerusalem Hill Road | 42.9649, -75.1170 | Public | |
| Treasure Mountain MineKing Street | 43.0240, -74.9800 | Paid / fee |
Neighboring counties in New York
Adjacent rockhounding counties, ranked by how close their centroids sit to Herkimer County. A natural extension if Herkimer County is already on your trip plan.
- Montgomery County~27 mi3 spotsTop: Herkimer Diamond, Quartz
- Onondaga County~54 mi3 spotsTop: Fluorite, Peridotite
- Warren County~68 mi3 spotsTop: Garnet, Almandine, Apatite
- Jefferson County~86 mi3 spotsTop: Barite, Fluorite, Hematite
- Saint Lawrence County~91 mi8 spotsTop: Barite, Fluorite, Tremolite
- Essex County~93 mi10 spotsTop: Labradorite, Graphite, Scapolite
Across the state line from Herkimer County
Rockhounding counties in neighboring states within driving range. Geology rarely respects state borders — these are often the closest mapped spots you can reach without going deeper into New York.
Herkimer County FAQ
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