Halurgite is a rare magnesium borate mineral typically found in evaporite deposits associated with salt domes. It is most recognized for its tabular habit and perfect cleavage, often appearing as colorless to white crystalline masses within saline environments.
Is this halurgite?
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 halurgite with a known reference. Halurgite sits at Mohs 3 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Halurgite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Halurgite 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 to prismatic crystals, often as fibrous aggregates.
Often confused with
Halurgite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside halurgite
Minerals reported to co-occur with halurgite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Mg₂B₄O₇·H₂O
- Mohs hardness
- 3
- Density
- 2.44 g/cm³
- Streak
- White
- Luster
- Vitreous
- Transparency
- Transparent
- Crystal system
- Monoclinic
- Crystal habit
- Tabular to Prismatic Crystals, Often as Fibrous Aggregates
- Cleavage
- Perfect On {010}
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Salt Domes and Evaporite Deposits
- Typical price
- $50-300 per specimen
Where rockhounds find halurgite
Classic worldwide localities
- Inder Deposit, Kazakhstan
Field-hunting tip
Look in salt domes and evaporite deposits country — that is the host setting where halurgite typically forms. If you start seeing halite, sylvite, boracite in float, you are in the right ground. Field specimens usually show a tabular to prismatic crystals, often as fibrous aggregates habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find halurgite on the map
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