Manganhumite is a rare member of the Humite group characterized by its high manganese content compared to other members. It is typically found in metasomatized carbonate rocks or skarns, often forming granular aggregates with other silicates and carbonates.
Is this manganhumite?
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 manganhumite with a known reference. Manganhumite sits at Mohs 6-6.5 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Manganhumite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Manganhumite typically shows a vitreous to resinous luster.
- 4Match the color rangeCompare against the expected color range: yellow, yellowish-brown, brown, reddish-brown.
- 5Look at form & habitCrystal system: orthorhombic. Typical habit: granular to massive.
Often confused with
Manganhumite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside manganhumite
Minerals reported to co-occur with manganhumite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- (Mg,Mn)₇(SiO₄)₃(OH,F)₂
- Mohs hardness
- 6-6.5
- Density
- 3.3-3.4 g/cm³
- Streak
- White
- Luster
- Vitreous to Resinous
- Transparency
- Translucent
- Crystal system
- Orthorhombic
- Crystal habit
- Granular to Massive
- Cleavage
- Poor
- Rarity
- Rare
- Uses
- Collector, Scientific Research
- Host rock
- Metamorphosed Limestone and Skarns
- Typical price
- $20-100 per specimen
Where rockhounds find manganhumite
Classic worldwide localities
- Sweden
- USA
- Japan
Field-hunting tip
Look in metamorphosed limestone and skarns country — that is the host setting where manganhumite typically forms. If you start seeing calcite, dolomite, forsterite in float, you are in the right ground. Field specimens usually show a granular to massive habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find manganhumite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
