Triplite is a manganese phosphate mineral that typically occurs as dense, massive, or granular aggregates in phosphate-rich pegmatites. Collectors should look for its characteristic warm brown to reddish-brown hues and greasy-to-vitreous luster, which often helps distinguish it from other phosphate species.
Is this triplite?
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 triplite with a known reference. Triplite sits at Mohs 4-5.5 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Triplite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Triplite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: brown, reddish-brown, orange-brown, yellowish-brown.
- 5Look at form & habitCrystal system: monoclinic. Typical habit: massive, granular, rarely as short prismatic crystals.
Often confused with
Triplite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside triplite
Minerals reported to co-occur with triplite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- (Mn,Fe)²⁺₂(PO₄)(F,OH)
- Mohs hardness
- 4-5.5
- Density
- 3.8-3.9 g/cm³
- Streak
- White
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Monoclinic
- Crystal habit
- Massive, Granular, Rarely as Short Prismatic Crystals
- Cleavage
- Distinct in One Direction
- Rarity
- Rare
- Uses
- Collector, Scientific Research
- Host rock
- Granite Pegmatites
- Typical price
- $20-150 for thumbnail to small cabinet specimens
Where rockhounds find triplite
Classic worldwide localities
- Czech Republic
- Germany
- Brazil
- USA (California)
- USA (Maine)
Field-hunting tip
Look in granite pegmatites country — that is the host setting where triplite typically forms. If you start seeing beryl, quartz, muscovite in float, you are in the right ground. Field specimens usually show a massive, granular, rarely as short prismatic crystals habit, so train your eye for that shape before scanning the outcrop.
Common questions
How do you identify triplite?+
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Find triplite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
