Meurigite-Na is a rare hydrous sodium-iron phosphate mineral belonging to the meurigite group. It is typically found as secondary crusts or fibrous, radiating spherules within weathered phosphate-rich pegmatites, often identified by its distinct yellow color and occurrence alongside other iron phosphates.
Is this meurigite-na?
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 meurigite-na with a known reference. Meurigite-Na sits at Mohs 3-4 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Meurigite-Na leaves a yellow streak.
- 3Read the lusterHold the specimen under a strong light. Meurigite-Na typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: yellow, brownish-yellow, orange-yellow.
- 5Look at form & habitCrystal system: monoclinic. Typical habit: radial aggregates, spherical crusts, fibrous tufts.
Often confused with
Meurigite-Na vs. its common look-alikes — and how to tell them apart in the field.
How to tell apart: Streak differs — Meurigite-Na leaves yellow, Meurigite-K leaves yellowish-white.
How to tell apart: Streak differs — Meurigite-Na leaves yellow, Rockbridgeite leaves greenish-brown.
How to tell apart: Streak differs — Meurigite-Na leaves yellow, Kidwellite leaves yellowish-white.
Often found alongside meurigite-na
Minerals reported to co-occur with meurigite-na. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- NaFe³⁺₇(PO₄)₄(OH)₈·8H₂O
- Mohs hardness
- 3-4
- Density
- 2.80-2.90 g/cm³
- Streak
- Yellow
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Monoclinic
- Crystal habit
- Radial Aggregates, Spherical Crusts, Fibrous Tufts
- Cleavage
- None
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Phosphate-rich Granite Pegmatites
- Typical price
- $50-300 per specimen depending on size and quality
Where rockhounds find meurigite-na
Classic worldwide localities
- Hagendorf, Bavaria, Germany
- Santa Luzia, Minas Gerais, Brazil
- Mangualde, Portugal
Field-hunting tip
Look in phosphate-rich granite pegmatites country — that is the host setting where meurigite-na typically forms. If you start seeing triphylite, phosphosiderite, strengite in float, you are in the right ground. Field specimens usually show a radial aggregates, spherical crusts, fibrous tufts habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find meurigite-na on the map
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