Hydroxylwagnerite is a rare phosphate mineral occurring in granite pegmatites. It is visually similar to wagnerite and triplite, often requiring X-ray diffraction or chemical analysis for positive identification.
Is this hydroxylwagnerite?
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 hydroxylwagnerite with a known reference. Hydroxylwagnerite sits at Mohs 5-5.5 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Hydroxylwagnerite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Hydroxylwagnerite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: yellow, brown, colorless.
- 5Look at form & habitCrystal system: monoclinic. Typical habit: prismatic crystals.
Often confused with
Hydroxylwagnerite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside hydroxylwagnerite
Minerals reported to co-occur with hydroxylwagnerite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Mg₂PO₄(OH)
- Mohs hardness
- 5-5.5
- Density
- 3.3 g/cm³
- Streak
- White
- Luster
- Vitreous
- Transparency
- Transparent
- Crystal system
- Monoclinic
- Crystal habit
- Prismatic Crystals
- Cleavage
- Distinct On {100}
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Granite Pegmatites
- Typical price
- $50-300 per specimen
Where rockhounds find hydroxylwagnerite
Classic worldwide localities
- Norway
- Germany
- Brazil
- Canada
Field-hunting tip
Look in granite pegmatites country — that is the host setting where hydroxylwagnerite typically forms. If you start seeing quartz, muscovite, apatite in float, you are in the right ground. Field specimens usually show a prismatic crystals habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find hydroxylwagnerite on the map
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