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, 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.
