Bischofite is a highly deliquescent mineral that forms in evaporite deposits, meaning it will dissolve in moist air or even liquefy if handled with damp fingers. Collectors must store this mineral in an airtight, low-humidity environment to prevent it from breaking down. It is typically found in massive or granular forms within salt beds.
Is this bischofite?
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 bischofite with a known reference. Bischofite sits at Mohs 1.5-2 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Bischofite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Bischofite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: colorless, white.
- 5Look at form & habitCrystal system: monoclinic. Typical habit: granular, fibrous, or massive aggregates.
Often confused with
Bischofite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside bischofite
Minerals reported to co-occur with bischofite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- MgCl₂·6H₂O
- Mohs hardness
- 1.5-2
- Density
- 1.59 g/cm³
- Streak
- White
- Luster
- Vitreous
- Transparency
- Transparent
- Crystal system
- Monoclinic
- Crystal habit
- Granular, Fibrous, Or Massive Aggregates
- Cleavage
- Perfect in One Direction
- Rarity
- Uncommon
- Uses
- Collector, Scientific Research
- Host rock
- Evaporite Deposits
- Typical price
- $10-50 per specimen
Where rockhounds find bischofite
1 mapped spotsClassic worldwide localities
- Stassfurt, Germany
- Solikamsk, Russia
- Carlsbad, New Mexico, USA
- Dead Sea, Israel/Jordan
Field-hunting tip
Look in evaporite deposits country — that is the host setting where bischofite typically forms. If you start seeing carnallite, halite, sylvite in float, you are in the right ground. Field specimens usually show a granular, fibrous, or massive aggregates habit, so train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in Nevada — start trip planning there.
Common questions
How do you identify bischofite?+
Where is bischofite found?+
Can I find bischofite in the United States?+
How much is bischofite worth?+
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What minerals are found with bischofite?+
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Find bischofite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
