Native bismuth is highly prized by collectors for its distinctive hopper-shaped, stepped crystal growth and striking iridescent tarnish. It is primarily found in hydrothermal veins associated with tin, cobalt, and nickel ores, often forming unique geometric structures when artificially melted and cooled.
Is this bismuth?
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 bismuth with a known reference. Bismuth sits at Mohs 2-2.5, softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Streak: pale silver.
- 3Read the lusterHold the specimen under a strong light. Luster: metallic.
- 4Match the color rangeCompare against the expected color range: silver white, pinkish white, red.
- 5Look at form & habitCrystal system: trigonal. Typical habit: granular, lamellar, platy.
Often confused with
Bismuth vs. its common look-alikes, and how to tell them apart in the field.
How to tell apart: Streak differs, so Bismuth leaves pale silver, Galena leaves lead-gray.
How to tell apart: Streak differs, so Bismuth leaves pale silver, Stibnite leaves lead-gray.
How to tell apart: Arsenopyrite is the harder of the two (Mohs 5.5-6 vs. 2-2.5); streak differs, so Bismuth leaves pale silver, Arsenopyrite leaves black.
Often found alongside bismuth
Minerals reported to co-occur with bismuth. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Bi
- Mohs hardness
- 2-2.5
- Density
- 9.70-9.83 g/cm³
- Streak
- Pale silver
- Luster
- Metallic
- Transparency
- Opaque
- Crystal system
- Trigonal
- Crystal habit
- Granular, lamellar, platy
- Cleavage
- Perfect on {0001}, good on {1011}, poor on {1014}
- Rarity
- Uncommon
- Uses
- Collector, Scientific research, Alloys
- Host rock
- In hydrothermal veins with ores of Co, Ni, Ag, and Sn; in pegmatites and topaz-bearing Sn–W quartz veins
Where rockhounds find bismuth
8 mapped spotsClassic worldwide localities
- Altenberg, Schneeberg, and Annaberg, Saxony, Germany
- Jáchymov (Joachimsthal), Czech Republic
- Villanueva de Córdoba, Córdoba Province, Spain
- Dolcoath and other mines, Cornwall, England
- Uncia, Chorolque, Llallagua, and Tazna, Potosí, Bolivia, economically important
- An 11 kg nugget found at Velaque, La Paz, Bolivia
Field-hunting tip
Where it forms: In hydrothermal veins with ores of Co, Ni, Ag, and Sn; in pegmatites and topaz-bearing Sn–W quartz veins. If you start seeing chalcopyrite, arsenopyrite, pyrrhotite in float, you are in the right ground. Typical habit: granular, lamellar, platy. Train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in Connecticut, California, Utah. Start trip planning there.
More bismuth photos
Common questions
How do you identify bismuth?+
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Can I find bismuth in the United States?+
What rocks look like bismuth?+
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Find bismuth on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
