Rockhounding in Herkimer County, New York

8 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.

1 photo

Herkimer diamond, a doubly terminated quartz crystal from the Herkimer district, New York — Ace of Diamonds & Herkimer Diamond MineHerkimer County, New York

Minerals reported in Herkimer County

Standout in Herkimer County

Hand-picked spot in Herkimer County, chosen for unusual mineralogy or documented public access. Each card opens the full coordinates and access notes.

Top pick
Ace of Diamonds & Herkimer Diamond Mine
Public
Herkimer 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. It is the single most famous rockhounding destination in New York, with productive vug-lined dolostone that reliably yields loose, water-clear crystals.
Herkimer Diamond

Spots in Herkimer County

Spot	Minerals	Coordinates	Access
Ace of Diamonds & Herkimer Diamond Mine	Herkimer Diamond	43.1315, -74.9741	Public
Ace of Diamonds MineNew York State Thruway	Herkimer Diamond	43.0110, -74.9720	Paid / fee
Diamond Mountain MiningNY 5S	Garnet Epidote Quartz	43.0150, -74.8740	Paid / fee
General Area (Herkimer County 1)State Highway 28	Herkimer Diamond	43.1532, -74.9781	Public
General Area (Herkimer County 2)State Highway 29	Herkimer Diamond	43.1377, -74.9484	Public
General Area (Herkimer County 3)	Herkimer Diamond	43.1112, -74.9947	Public
Herkimer Diamond Mines		43.1292, -74.9763	Paid / fee
Treasure Mountain MineKing Street	Quartz Fluorite Calcite Galena	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.

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.

Berkshire County~100 miMassachusetts · 3 spotsTop: Asbestos, Green Quartz, Smoky Quartz

Herkimer County FAQ

Where can I rockhound in Herkimer County, New York?+

RockHoundR tracks 8 rockhounding spots in Herkimer County. Each entry below has coordinates, mineral notes, and access type. Always confirm local rules before collecting.

What rocks and minerals are common in Herkimer County?+

Spots in Herkimer County most often produce Herkimer Diamond, Quartz, Calcite, Epidote, Fluorite. Individual spots can vary widely.

Are these Herkimer County rockhounding spots on public land?+

Most spots in this list are tagged public, but access can change with seasons, claims, and local closures. Always verify before driving out — links in the app open the right BLM, USFS, or county pages.

Plan a Herkimer County rockhounding trip

Open RockHoundR to see these spots on the map alongside land overlays, weather, geology, and your saved finds.