Native bismuth is highly sought after by collectors for its iconic iridescent, staircase-like 'hopper' crystal structures, which form when it cools rapidly. It is remarkably heavy for its size due to its high density and is easily recognized by its bright, multi-colored surface oxidation. It is most commonly found in hydrothermal veins associated with cobalt and silver deposits.
Is this native 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 native bismuth with a known reference. Native 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, iridescent, red.
- 5Look at form & habitCrystal system: trigonal. Typical habit: granular, lamellar, platy.
Often confused with
Native Bismuth vs. its common look-alikes, and how to tell them apart in the field.
How to tell apart: Streak differs, so Native Bismuth leaves pale silver, Antimony leaves gray.
How to tell apart: Streak differs, so Native Bismuth leaves pale silver, Galena leaves lead-gray.
How to tell apart: Arsenic is the harder of the two (Mohs 3.5 vs. 2-2.5); streak differs, so Native Bismuth leaves pale silver, Arsenic leaves tin-white; luster reads metallic on Native Bismuth and nearly metallic on Arsenic.
Often found alongside native bismuth
Minerals reported to co-occur with native 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
- Colors
- 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, Industrial, Decorative
- 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 native bismuth
Classic 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.
Common questions
How do you identify native bismuth?+
Where is native bismuth found?+
What rocks look like native bismuth?+
What minerals are found with native bismuth?+
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Find native bismuth on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
