Natron is a naturally occurring mixture of sodium carbonate decahydrate and other salts typically found in saline lake beds. It is highly unstable when exposed to dry air and will rapidly dehydrate into white, powdery thermonatrite. Collectors should store samples in airtight containers to prevent degradation.
Is this natron?
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 natron with a known reference. Natron sits at Mohs 1-1.5 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Natron leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Natron typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: colorless, white, gray, yellowish.
- 5Look at form & habitCrystal system: monoclinic. Typical habit: efflorescent crusts, powdery coatings, massive aggregates.
Often confused with
Natron vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside natron
Minerals reported to co-occur with natron. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Na₂CO₃·10H₂O
- Mohs hardness
- 1-1.5
- Density
- 1.42-1.47 g/cm³
- Streak
- White
- Luster
- Vitreous
- Transparency
- Transparent
- Crystal system
- Monoclinic
- Crystal habit
- Efflorescent Crusts, Powdery Coatings, Massive Aggregates
- Cleavage
- Perfect
- Rarity
- Common
- Uses
- Industrial, Historical Preservation, Collector
- Host rock
- Evaporite Lake Deposits
- Typical price
- $5-30 per specimen
Where rockhounds find natron
Classic worldwide localities
- Wadi El Natrun (Egypt)
- Owens Lake (USA)
- Lake Magadi (Kenya)
- Searles Lake (USA)
- Lake Chad (Chad)
Field-hunting tip
Look in evaporite lake deposits country — that is the host setting where natron typically forms. If you start seeing halite, thenardite, gaylussite in float, you are in the right ground. Field specimens usually show a efflorescent crusts, powdery coatings, massive aggregates habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find natron on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
