Defiance Quarry — Rockhounding in Saint Charles County, Missouri
Defiance Quarry is a mapped rockhounding spot in Saint Charles County, Missouri. Reported finds include yellow calcite, white calcite, goethite, marcasite, pyrite, and more. Below: coordinates, access notes, nearby spots, and trip-planning links.
Map showing Defiance Quarry in Saint Charles County, Missouri
Quick details
- Access
- Public area
- County
- Saint Charles County
- State
- Missouri
- Nearest road
- MO DD
- Postcode
- 63341
- Coordinates
- 38.66076, -90.77598
Land & collecting status
Generally open to casual rockhounding
Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig.
Public-land rules vary by agency, season, and field office. The RockHoundR app pulls live BLM, USFS, NPS, and tribal overlays so you can see exactly which agency manages the ground at this spot.
Found at Defiance Quarry
Each chip links to all spots in the U.S. that produce that material.
- Yellow Calcite
- White Calcite
- Goethite
- Marcasite
- Pyrite
- Sphalerite
- Fossils
Nearby rockhounding spots
Other rockhounding spots within driving distance of Defiance Quarry.
- ChesterfieldSaint Charles County · 9 mi awayGarnet, Staurolite
- Weber QuarrySaint Charles County · 10 mi awayGeodes, Fluorite, Millerite
- Saint Charles QuarrySaint Charles County · 16 mi awayYellow Calcite, Green Calcite, Chert Nodules
- St. Louis (calcite area)Saint Louis County · 17 mi awayCalcite, Millerite, Quartz
- Old MonroeLincoln County · 19 mi awayLake Superior Agate, Garnet, Staurolite
- TroyLincoln County · 20 mi awayCalcite, Marcasite, Pyrite
- St. Louis (barite area)Saint Louis County · 20 mi awayBarite, Calcite, Goethite
- Jefferson CountyJefferson County · 24 mi awayCalcite Nodules, Sphalerite
