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This is a large, high-activity uranium ore specimen collected from the Green River uranium district of Utah, one of the most historically important sandstone-hosted uranium regions in the United States. The specimen displays classic Colorado Plateau–style mineralization, with yellow uranium staining distributed across fractured and layered sandstone surfaces.
The rugged sedimentary matrix shows how uranium naturally concentrates along bedding planes and fractures, creating diffuse but energetic mineralization rather than a single hotspot. This makes the piece especially satisfying for hands-on radiation detection, as activity is consistently present across much of the specimen rather than confined to one point.
Averaging approximately 40,000 CPM, this is a substantial and energetic display piece. Its combination of mass, surface area, and activity makes it ideal for advanced collectors, educational settings, and radiation instrumentation testing with pancake probes, scintillation detectors, and survey meters. The specimen is completely natural — no stabilization, polishing, or enhancement of any kind.
Weight: 2 lb 11 oz (1.22 kg)
Dimensions: approx. 8 × 4.5 × 1.5 inches (20.3 × 11.4 × 3.8 cm)
Locality: Green River uranium district, Utah, USA
Condition: Natural, unprocessed, no stabilization or enhancement
Measured Activity: ~40,000 CPM (average)
Instrument: Pancake Geiger probe (device-dependent)
UV Response: None observed
Shipping: Ships legally under UN 2910 – Excepted Radioactive Material
⚠️ Radiation Notice:
This specimen emits measurable ionizing radiation. Avoid prolonged handling and display appropriately.
Geology: Classic Colorado Plateau sandstone-hosted uranium
Visible uranium minerals: Yellow secondary uranium mineralization (carnotite/related species)
Associated non-uranium minerals: Sandstone matrix, iron oxides, clays
Activity level: Strong relative to size
Best use cases:
Educational and teaching specimen
CPM comparison reference
Detector and probe testing
Authentic radioactive display piece
Best for:
Uranium & element collectors
Advanced radioactive mineral collections
Schools, labs, and instrumentation enthusiasts
This is a large, high-activity uranium ore specimen collected from the Green River uranium district of Utah, one of the most historically important sandstone-hosted uranium regions in the United States. The specimen displays classic Colorado Plateau–style mineralization, with yellow uranium staining distributed across fractured and layered sandstone surfaces.
The rugged sedimentary matrix shows how uranium naturally concentrates along bedding planes and fractures, creating diffuse but energetic mineralization rather than a single hotspot. This makes the piece especially satisfying for hands-on radiation detection, as activity is consistently present across much of the specimen rather than confined to one point.
Averaging approximately 40,000 CPM, this is a substantial and energetic display piece. Its combination of mass, surface area, and activity makes it ideal for advanced collectors, educational settings, and radiation instrumentation testing with pancake probes, scintillation detectors, and survey meters. The specimen is completely natural — no stabilization, polishing, or enhancement of any kind.
Weight: 2 lb 11 oz (1.22 kg)
Dimensions: approx. 8 × 4.5 × 1.5 inches (20.3 × 11.4 × 3.8 cm)
Locality: Green River uranium district, Utah, USA
Condition: Natural, unprocessed, no stabilization or enhancement
Measured Activity: ~40,000 CPM (average)
Instrument: Pancake Geiger probe (device-dependent)
UV Response: None observed
Shipping: Ships legally under UN 2910 – Excepted Radioactive Material
⚠️ Radiation Notice:
This specimen emits measurable ionizing radiation. Avoid prolonged handling and display appropriately.
Geology: Classic Colorado Plateau sandstone-hosted uranium
Visible uranium minerals: Yellow secondary uranium mineralization (carnotite/related species)
Associated non-uranium minerals: Sandstone matrix, iron oxides, clays
Activity level: Strong relative to size
Best use cases:
Educational and teaching specimen
CPM comparison reference
Detector and probe testing
Authentic radioactive display piece
Best for:
Uranium & element collectors
Advanced radioactive mineral collections
Schools, labs, and instrumentation enthusiasts
