Hejtmanite is a rare manganese-bearing silicate mineral belonging to the bafertisite group. It typically occurs as small brown lamellar or tabular crystals within alkaline syenite pegmatites, often identified by its distinct cleavage and associations with other rare-earth minerals.
Is this hejtmanite?
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 hejtmanite with a known reference. Hejtmanite sits at Mohs 3-4, softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Hejtmanite leaves a brownish yellow streak.
- 3Read the lusterHold the specimen under a strong light. Hejtmanite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: brownish, golden, yellow.
- 5Look at form & habitCrystal system: monoclinic. Typical habit: lamellar to tabular crystals.
Often confused with
Hejtmanite vs. its common look-alikes, and how to tell them apart in the field.
How to tell apart: Streak differs, so Hejtmanite leaves brownish yellow, Bafertisite leaves yellowish; luster reads vitreous on Hejtmanite and pearly on Bafertisite.
How to tell apart: Streak differs, so Hejtmanite leaves brownish yellow, Jinshajiangite leaves yellow-brown.
Often found alongside hejtmanite
Minerals reported to co-occur with hejtmanite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Ba₂Mn₄Ti(Si₂O₇)₂O₂(OH,F)₂
- Mohs hardness
- 3-4
- Density
- 3.91 g/cm³
- Streak
- Brownish Yellow
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Monoclinic
- Crystal habit
- Lamellar to Tabular Crystals
- Cleavage
- Perfect On {001}
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Alkaline Igneous Rocks and Pegmatites
Where rockhounds find hejtmanite
Classic worldwide localities
- Mbolwe Hill, Mkushi River area, Central Province, Zambia
Field-hunting tip
Look in alkaline igneous rocks and pegmatites country, the host setting where hejtmanite typically forms. If you start seeing aegirine, nepheline, orthoclase in float, you are in the right ground. Field specimens usually show a lamellar to tabular crystals habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find hejtmanite on the map
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