Kahlenbergite is an exceptionally rare potassium aluminum titanate discovered within carbonate-rich xenoliths in volcanic rocks. It typically occurs as small, light brown to yellow-brown grains and is primarily of interest to advanced mineralogists and systematic collectors focusing on rare volcanic species.
Is this kahlenbergite?
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 kahlenbergite with a known reference. Kahlenbergite sits at Mohs 6-7, softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Kahlenbergite leaves a light brown streak.
- 3Read the lusterHold the specimen under a strong light. Kahlenbergite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: light brown, yellow-brown, light orange.
- 5Look at form & habitCrystal system: hexagonal. Typical habit: equant to tabular grains, massive.
Often confused with
Kahlenbergite vs. its common look-alikes, and how to tell them apart in the field.
How to tell apart: Streak differs, so Kahlenbergite leaves light brown, Nepheline leaves white; luster reads vitreous on Kahlenbergite and vitreous to greasy on Nepheline.
How to tell apart: Streak differs, so Kahlenbergite leaves light brown, Kalsilite leaves white.
Often found alongside kahlenbergite
Minerals reported to co-occur with kahlenbergite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- KAlTiO₄
- Mohs hardness
- 6-7
- Density
- 3.4 g/cm³
- Streak
- Light Brown
- Luster
- Vitreous
- Transparency
- Transparent
- Crystal system
- Hexagonal
- Crystal habit
- Equant to Tabular Grains, Massive
- Cleavage
- Good On {001}
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Xenoliths in Volcanic Rocks
Where rockhounds find kahlenbergite
Classic worldwide localities
- Bellerberg Volcano, Eifel, Germany
Field-hunting tip
Look in xenoliths in volcanic rocks country, the host setting where kahlenbergite typically forms. If you start seeing ettringite, calcite, phillipsite-k in float, you are in the right ground. Field specimens usually show a equant to tabular grains, massive habit, so train your eye for that shape before scanning the outcrop.
Common questions
How do you identify kahlenbergite?+
Where is kahlenbergite found?+
What rocks look like kahlenbergite?+
What minerals are found with kahlenbergite?+
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Find kahlenbergite on the map
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