Xenophyllite is a rare phosphate mineral typically appearing as yellow to greenish-yellow lamellar or platy crystals. It is most commonly found in specific hydrothermal vein environments, often occurring in association with other phosphate minerals like vivianite.
Is this xenophyllite?
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 xenophyllite with a known reference. Xenophyllite sits at Mohs 3.5-4, softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Streak: white.
- 3Read the lusterHold the specimen under a strong light. Luster: vitreous.
- 4Match the color rangeCompare against the expected color range: bluish green, gray-green.
- 5Look at form & habitCrystal system: triclinic. Typical habit: lamellar to platy crystals.
Often confused with
Xenophyllite vs. its common look-alikes, and how to tell them apart in the field.
Often found alongside xenophyllite
Minerals reported to co-occur with xenophyllite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Na₄Fe₇(PO₄)₆
- Mohs hardness
- 3.5-4
- Density
- 3.58 g/cm³
- Colors
- Streak
- White
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Triclinic
- Crystal habit
- Lamellar to platy crystals
- Cleavage
- Perfect on {010}
- Rarity
- Rare
- Uses
- Collector
- Host rock
- In phosphide-phosphate assemblages confined to troilite nodules of an iron meteorite (medium octahedrite, IIIAB)
Where rockhounds find xenophyllite
Classic worldwide localities
- Augustinovka iron meteorite, Ekaterinoslav (now Dnepropetrovsk), Ukraine (type locality)
Field-hunting tip
Where it forms: In phosphide-phosphate assemblages confined to troilite nodules of an iron meteorite (medium octahedrite, IIIAB). If you start seeing sarcopside, schreibersite, chromite in float, you are in the right ground. Typical habit: lamellar to platy crystals. Train your eye for that shape before scanning the outcrop.
Common questions
How do you identify xenophyllite?+
Where is xenophyllite found?+
What rocks look like xenophyllite?+
What minerals are found with xenophyllite?+
What kind of rock does xenophyllite form in?+
What is xenophyllite used for?+
Find xenophyllite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
