Natroniobite is a rare sodium niobate mineral that typically forms as a secondary alteration product in alkaline pegmatite environments. It is most frequently identified by its distinct yellowish-brown color and submetallic luster, though it is often difficult to distinguish from other niobates without chemical analysis.
Is this natroniobite?
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 natroniobite with a known reference. Natroniobite sits at Mohs 5.5-6, softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Streak: gray.
- 3Read the lusterHold the specimen under a strong light. Luster: submetallic.
- 4Match the color rangeCompare against the expected color range: yellow, brownish, blackish.
- 5Look at form & habitCrystal system: monoclinic. Typical habit: granular.
Often confused with
Natroniobite vs. its common look-alikes, and how to tell them apart in the field.
How to tell apart: Streak differs, so Natroniobite leaves gray, Columbite leaves blackish brown.
How to tell apart: Streak differs, so Natroniobite leaves gray, Pyrochlore leaves brown; luster reads submetallic on Natroniobite and vitreous to resinous on Pyrochlore.
Often found alongside natroniobite
Minerals reported to co-occur with natroniobite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- NaNbO₃
- Mohs hardness
- 5.5-6
- Density
- 4.40 g/cm³
- Streak
- Gray
- Luster
- Submetallic
- Transparency
- Semitransparent
- Crystal system
- Monoclinic
- Crystal habit
- Granular
- Cleavage
- Distinct
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Replacing perovskite and pyrochlore in dolomite carbonatites
Where rockhounds find natroniobite
Classic worldwide localities
- Gem Park, about six km east of Hillside, Fremont Co., Colorado, USA
- Lesnaya Varaka massif, Kola Peninsula, Russia
- Sallanlatvi massif, northern Karelia, Russia
Field-hunting tip
Where it forms: Replacing perovskite and pyrochlore in dolomite carbonatites. If you start seeing dolomite, apatite, phlogopite in float, you are in the right ground. Typical habit: granular. Train your eye for that shape before scanning the outcrop.
Common questions
How do you identify natroniobite?+
Where is natroniobite found?+
What rocks look like natroniobite?+
What minerals are found with natroniobite?+
What kind of rock does natroniobite form in?+
What is natroniobite used for?+
Find natroniobite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
