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, 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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