Uklonskovite is a rare sodium magnesium sulfate fluoride mineral found primarily in evaporite deposits. It typically forms clear, tabular crystals or fine-grained aggregates and is highly sought after by mineral collectors for its unique chemistry and rarity.
Is this uklonskovite?
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 uklonskovite with a known reference. Uklonskovite sits at Mohs 2.5 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Uklonskovite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Uklonskovite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: white, colorless.
- 5Look at form & habitCrystal system: monoclinic. Typical habit: tabular crystals, aggregates.
Often confused with
Uklonskovite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside uklonskovite
Minerals reported to co-occur with uklonskovite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- NaMg(SO₄)F·2H₂O
- Mohs hardness
- 2.5
- Density
- 2.33 g/cm³
- Streak
- White
- Luster
- Vitreous
- Transparency
- Transparent
- Crystal system
- Monoclinic
- Crystal habit
- Tabular Crystals, Aggregates
- Cleavage
- Perfect
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Evaporite Deposits
- Typical price
- $50-300 per specimen
Where rockhounds find uklonskovite
Classic worldwide localities
- Inder Deposit, Kazakhstan
Field-hunting tip
Look in evaporite deposits country — that is the host setting where uklonskovite typically forms. If you start seeing borax, glauberite, halite in float, you are in the right ground. Field specimens usually show a tabular crystals, aggregates habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find uklonskovite on the map
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