Florissant: Calcite & Celestite Rockhounding in Saint Louis County, Missouri

Updated June 2026

Florissant is a mapped rockhounding spot in Saint Louis County, Missouri. Reported finds include calcite, celestite. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Saint Louis County
State: Missouri
Nearest road: Lewis and Clark Boulevard
Postcode: 63034
Coordinates: 38.83729, -90.23291

Geology at Florissant

This spot sits on ground mapped as limestone that formed roughly 360 to 325 million years ago. Carbonate rock like this dissolves and weathers readily, so fresh road cuts, quarries, and creek exposures are typically the most productive ground.

Age: 360–325 Ma (Mississippian)
Rock types: limestone
Elevation: 400 ft

Geologic mapping via Macrostrat and the underlying state geological survey maps (CC BY 4.0). Bedrock at the surface can vary within a mapped unit.

Best time to visit Florissant

Best months: March to November. Typical highs run 87°F in midsummer and 39°F in midwinter, with winter lows near 22°F.

Climate normals: NOAA 1991-2020 monthlies, ALTON - MELVIN PRICE L&D station (5 mi away).

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.

Sources & verification

Spot details combine the public RockHoundR location dataset, normalized mineral labels, agency land-status checks in the app, and community submissions. Coordinates are approximate until verified in the field.

Sources: RockHoundR public spot dataset, app land overlays, and local agency review before each trip.

Found at Florissant

Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.

Nearby rockhounding spots

Other rockhounding spots within driving distance of Florissant.

Across the state line from Florissant

Florissant is close enough to the Missouri border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Florissant FAQ

Where is Florissant?+

Florissant is in Saint Louis County, Missouri, at 38.83729, -90.23291. Nearest road: Lewis and Clark Boulevard.

What rocks and minerals can you find at Florissant?+

Florissant is reported to produce Calcite, Celestite.

Is collecting allowed at Florissant?+

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. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Florissant?+

A rock hammer, sturdy gloves, safety glasses, and a collecting bag cover the basics here. Add a spray bottle: wet rock shows color and pattern that dry rock hides.

When is the best time to visit Florissant?+

The most comfortable months at Florissant are March to November.

How do I get to Florissant?+

Open the directions link to navigate to 38.83729, -90.23291 in Google Maps. The nearest road is Lewis and Clark Boulevard.

More rockhounding in Missouri

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Open Florissant on the map

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