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, so 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, so 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
17 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, 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, Connecticut, North Carolina. Start trip planning there.
Common questions
How do you identify columbite?+
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Find columbite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
