Ace of Diamonds Mine, Middleville NY

Where: East · North America · approx. 43.14, -74.96 (vicinity only)

Why this spot: A long-established fee mine at Middleville where you hammer dolostone for double-terminated Herkimer quartz.

What turns up: double-terminated Herkimer quartz 'diamonds', clusters, smoky and included crystals

Access: Permission required.

Fee dig, keep what you find, hard-rock digging into the ledge is permitted here. Seasonal hours, confirm before you go.

Satellite view, historic-map overlays, tide/flow context and field notes are in the app. Exact research detail is part of Pro.