Radioactive minerals represent a diverse group of species containing uranium or thorium, such as Uraninite and Autunite. Collectors should use a Geiger counter to identify these specimens and implement strict storage protocols to minimize radiation exposure.
Is this radioactive minerals?
5-step field checkRun through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.
- 1Test the hardnessTry to scratch radioactive minerals with a known reference. Radioactive Minerals sits at Mohs 1-6 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Radioactive Minerals leaves a variable streak.
- 3Read the lusterHold the specimen under a strong light. Radioactive Minerals typically shows a variable luster.
- 4Match the color rangeCompare against the expected color range: yellow, green, black, orange, brown.
- 5Look at form & habitCrystal system: variable. Typical habit: variable.
Often confused with
Radioactive Minerals vs. its common look-alikes — and how to tell them apart in the field.
How to tell apart: Streak differs — Radioactive Minerals leaves variable, Uraninite leaves brownish-black to greenish-black; luster reads variable on Radioactive Minerals and submetallic to dull on Uraninite.
How to tell apart: Streak differs — Radioactive Minerals leaves variable, Autunite leaves pale yellow; luster reads variable on Radioactive Minerals and pearly on Autunite.
How to tell apart: Streak differs — Radioactive Minerals leaves variable, Torbernite leaves pale green; luster reads variable on Radioactive Minerals and vitreous on Torbernite.
Often found alongside radioactive minerals
Minerals reported to co-occur with radioactive minerals. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Mohs hardness
- 1-6
- Density
- 3.5-10.0 g/cm³
- Streak
- Variable
- Luster
- Variable
- Transparency
- Opaque
- Crystal system
- Variable
- Crystal habit
- Variable
- Cleavage
- Variable
- Fluorescence
- Often Fluorescent
- Rarity
- Uncommon
- Uses
- Collector
- Host rock
- Granite Pegmatites, Hydrothermal Veins, Sedimentary Uranium Deposits
- Typical price
- $20-500 per specimen depending on size and species
Where rockhounds find radioactive minerals
1 mapped spotsClassic worldwide localities
- Democratic Republic of the Congo
- Canada
- USA
- Czech Republic
- France
Field-hunting tip
Look in granite pegmatites, hydrothermal veins, sedimentary uranium deposits country — that is the host setting where radioactive minerals typically forms. If you start seeing quartz, feldspar, mica in float, you are in the right ground. Field specimens usually show a variable habit, so train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in New Mexico — start trip planning there.
Common questions
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Find radioactive minerals on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
