Manganolangbeinite is a rare sulfate mineral that forms tetrahedral crystals within volcanic fumarole environments or potash-rich evaporite sequences. It is distinguished from other langbeinite group members by its distinct pink coloration caused by the substitution of manganese into the crystal structure.

Hardness

3.5-4

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent

mineralrareLangbeinite Group family

Manganolangbeinite

Hardness: 3.5-4
Luster: Vitreous
Streak: White
Transparency: Transparent

Is this manganolangbeinite?

5-step field check

Run through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.

1
Test the hardness
Try to scratch manganolangbeinite with a known reference. Manganolangbeinite sits at Mohs 3.5-4 — softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Manganolangbeinite leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Manganolangbeinite typically shows a vitreous luster.
4
Match the color range
Compare against the expected color range: pink, pale pink, colorless.
5
Look at form & habit
Crystal system: cubic. Typical habit: tetrahedral crystals, granular.

Often confused with

Manganolangbeinite vs. its common look-alikes — and how to tell them apart in the field.

Often found alongside manganolangbeinite

Minerals reported to co-occur with manganolangbeinite. Spotting these in float or country rock is a strong cue you are in the right ground.

All properties

Chemical formula: K₂Mn₂(SO₄)₃
Mohs hardness: 3.5-4
Density: 2.83 g/cm³
Colors: Pink Pale Pink Colorless
Streak: White
Luster: Vitreous
Transparency: Transparent
Crystal system: Cubic
Crystal habit: Tetrahedral Crystals, Granular
Cleavage: None
Rarity: Rare
Uses: Collector
Host rock: Fumarole Deposits, Evaporite Deposits
Typical price: $20-150 thumbnail

Where rockhounds find manganolangbeinite

Classic worldwide localities

Vesuvio volcano, Italy
Caracoles, Chile

Field-hunting tip

Look in fumarole deposits, evaporite deposits country — that is the host setting where manganolangbeinite typically forms. If you start seeing thenardite, anhydrite, sylvite in float, you are in the right ground. Field specimens usually show a tetrahedral crystals, granular habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify manganolangbeinite?+

Mohs hardness is 3.5-4. It typically shows a vitreous luster. The streak is white. Common colors include pink, pale pink, colorless.

Where is manganolangbeinite found?+

Notable localities include Vesuvio volcano, Italy; Caracoles, Chile.

How much is manganolangbeinite worth?+

Typical asking prices fall in the range of $20-150 thumbnail. Quality, size, and provenance can move individual specimens well outside that range.

What rocks look like manganolangbeinite?+

Manganolangbeinite is most often confused with Langbeinite, Vanthoffite. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with manganolangbeinite?+

Manganolangbeinite commonly co-occurs with Thenardite, Anhydrite, Sylvite, Halite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does manganolangbeinite form in?+

Manganolangbeinite typically forms in fumarole deposits, evaporite deposits. Working float back to the host body is the standard way to chase a fresh occurrence.

What is manganolangbeinite used for?+

Manganolangbeinite is used in collector.

Find manganolangbeinite on the map

RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.