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. Columbite leaves a black streak.
- 3Read the lusterHold the specimen under a strong light. Columbite typically shows a submetallic luster.
- 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 — Columbite leaves black, Tantalite leaves black to reddish-brown; luster reads submetallic on Columbite and submetallic to resinous on Tantalite.
How to tell apart: Columbite is noticeably harder (Mohs 6 vs. 4-4.5); streak differs — Columbite leaves black, Wolframite leaves dark brown to black; luster reads submetallic on Columbite and submetallic to metallic on Wolframite.
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
- Black
- 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
- Typical price
- $15-150 per specimen depending on crystal quality and size
Where rockhounds find columbite
15 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
Look in granite pegmatites country — that is the host setting where columbite typically forms. If you start seeing microcline, albite, muscovite in float, you are in the right ground. Field specimens usually show a tabular crystals, prismatic, massive habit, so train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in Maine, North Carolina, Connecticut — start trip planning there.
Common questions
How do you identify columbite?+
Where is columbite found?+
Can I find columbite in the United States?+
How much is columbite worth?+
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Find columbite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
