Columbite is a black, submetallic mineral that serves as the primary source of niobium. It is most frequently found in granitic pegmatites as well-defined orthorhombic crystals or massive grains, and is often mistaken for wolframite or ilmenite.
Is this columbite?
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 columbite with a known reference. Columbite sits at Mohs 6, softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Streak: blackish brown.
- 3Read the lusterHold the specimen under a strong light. Luster: submetallic.
- 4Match the color rangeCompare against the expected color range: black, brownish-black, iron-black.
- 5Look at form & habitCrystal system: orthorhombic. Typical habit: tabular crystals, prismatic, massive.
Often confused with
Columbite vs. its common look-alikes, and how to tell them apart in the field.
How to tell apart: Streak differs, so Columbite leaves blackish brown, Tantalite leaves black to reddish-brown.
How to tell apart: Columbite is noticeably harder (Mohs 6 vs. 4.5); streak differs, so Columbite leaves blackish brown, Wolframite leaves reddish brown.
How to tell apart: Streak differs, so Columbite leaves blackish brown, Ilmenite leaves black to reddish brown; luster reads submetallic on Columbite and metallic to submetallic on Ilmenite.
Often found alongside columbite
Minerals reported to co-occur with columbite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- (Fe,Mn)(Nb,Ta)₂O₆
- Mohs hardness
- 6
- Density
- 5.2-8.0 g/cm³
- Streak
- Blackish brown
- Luster
- Submetallic
- Transparency
- Opaque
- Crystal system
- Orthorhombic
- Crystal habit
- Tabular crystals, prismatic, massive
- Cleavage
- Distinct on {010}
- Rarity
- Uncommon
- Uses
- Collector, Ore of niobium, Ore of tantalum
- Host rock
- granite pegmatites
Where rockhounds find columbite
18 mapped spotsClassic worldwide localities
- Brazil
- Nigeria
- Norway
- Canada
- Madagascar
U.S. states with columbite
Each link opens a state-specific list of mapped rockhounding spots that produce columbite.
Field-hunting tip
Where it forms: granite pegmatites. If you start seeing microcline, albite, muscovite in float, you are in the right ground. Typical habit: tabular crystals, prismatic, massive. Train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in Connecticut, Maine, North Carolina. Start trip planning there.
Common questions
How do you identify columbite?+
Where is columbite found?+
Can I find columbite in the United States?+
Is columbite safe to handle?+
What rocks look like columbite?+
What minerals are found with columbite?+
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Find columbite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
