Columbium ore, historically known as columbite, is the primary source of the metal niobium. It typically appears as heavy, dark, prismatic crystals embedded within granitic pegmatites and is often associated with tantalum-rich minerals.
Is this columbium ore?
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 columbium ore with a known reference. Columbium Ore 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. Columbium Ore leaves a dark red to black streak.
- 3Read the lusterHold the specimen under a strong light. Columbium Ore 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: short prismatic crystals, tabular, massive.
Often confused with
Columbium Ore vs. its common look-alikes — and how to tell them apart in the field.
How to tell apart: Columbium Ore is noticeably harder (Mohs 6 vs. 4-4.5); streak differs — Columbium Ore leaves dark red to black, Wolframite leaves dark brown to black; luster reads submetallic on Columbium Ore and submetallic to metallic on Wolframite.
How to tell apart: Streak differs — Columbium Ore leaves dark red to black, Tantalite leaves black to reddish-brown; luster reads submetallic on Columbium Ore and submetallic to resinous on Tantalite.
How to tell apart: Streak differs — Columbium Ore leaves dark red to black, Manaccanite leaves black.
Often found alongside columbium ore
Minerals reported to co-occur with columbium ore. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- (Fe,Mn)Nb₂O₆
- Mohs hardness
- 6
- Density
- 5.2-8.0 g/cm³
- Streak
- Dark Red to Black
- Luster
- Submetallic
- Transparency
- Opaque
- Crystal system
- Orthorhombic
- Crystal habit
- Short Prismatic Crystals, Tabular, Massive
- Cleavage
- Distinct in One Direction
- Rarity
- Uncommon
- Uses
- Collector, Ore of Niobium
- Host rock
- Granite Pegmatites
- Typical price
- $15-150 depending on specimen size and locality quality
Where rockhounds find columbium ore
1 mapped spotsClassic worldwide localities
- Brazil
- Canada
- Australia
- Nigeria
- Democratic Republic of the Congo
Field-hunting tip
Look in granite pegmatites country — that is the host setting where columbium ore typically forms. If you start seeing quartz, microcline, albite in float, you are in the right ground. Field specimens usually show a short prismatic crystals, tabular, massive habit, so train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in Arkansas — start trip planning there.
Common questions
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Find columbium ore on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
