Grischunite is a rare phosphate mineral originally discovered in the manganese deposits of the Falotta mine in Switzerland. It typically appears as reddish-brown massive or granular masses, making it a challenging mineral for field identification without specialized analytical methods.
Is this grischunite?
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 grischunite with a known reference. Grischunite sits at Mohs 4 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Grischunite leaves a yellowish-brown streak.
- 3Read the lusterHold the specimen under a strong light. Grischunite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: reddish-brown, brown.
- 5Look at form & habitCrystal system: monoclinic. Typical habit: granular aggregates, rarely as small tabular crystals.
Often confused with
Grischunite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside grischunite
Minerals reported to co-occur with grischunite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- NaCaMn₂(Mn,Fe)₂(PO₄)₃
- Mohs hardness
- 4
- Density
- 3.75 g/cm³
- Colors
- Streak
- Yellowish-brown
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Monoclinic
- Crystal habit
- Granular Aggregates, Rarely as Small Tabular Crystals
- Cleavage
- None
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Manganese-rich Cherts and Silicate Rocks
- Typical price
- $50-300 per specimen
Where rockhounds find grischunite
Classic worldwide localities
- Falotta mine, Graubünden, Switzerland
Field-hunting tip
Look in manganese-rich cherts and silicate rocks country — that is the host setting where grischunite typically forms. If you start seeing braunite, rhodochrosite, quartz in float, you are in the right ground. Field specimens usually show a granular aggregates, rarely as small tabular crystals habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find grischunite on the map
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