Geschieberite is a rare sulfate mineral that typically forms as efflorescent coatings in mines or arid evaporite environments. It is highly soluble in water and requires careful storage in dry conditions to prevent dehydration or breakdown.
Is this geschieberite?
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 geschieberite with a known reference. Geschieberite sits at Mohs 2-2.5 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Geschieberite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Geschieberite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: white, colorless, pale yellow.
- 5Look at form & habitCrystal system: monoclinic. Typical habit: fibrous, efflorescent crusts, acicular.
Often confused with
Geschieberite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside geschieberite
Minerals reported to co-occur with geschieberite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- (K,Na)₂Mg(SO₄)₂·4H₂O
- Mohs hardness
- 2-2.5
- Density
- 2.1-2.2 g/cm³
- Streak
- White
- Luster
- Vitreous
- Transparency
- Transparent
- Crystal system
- Monoclinic
- Crystal habit
- Fibrous, Efflorescent Crusts, Acicular
- Cleavage
- Distinct
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Evaporite Deposits
- Typical price
- $20-100 per specimen
Where rockhounds find geschieberite
Classic worldwide localities
- Germany
- Czech Republic
- Poland
Field-hunting tip
Look in evaporite deposits country — that is the host setting where geschieberite typically forms. If you start seeing halite, epsomite, polyhalite in float, you are in the right ground. Field specimens usually show a fibrous, efflorescent crusts, acicular habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find geschieberite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
