Lepkhenelmite-Zn is a rare member of the labuntsovite group of minerals, typically found as small, elongated prismatic crystals in alkaline pegmatites. It is visually indistinguishable from other group members without advanced chemical analysis and is primarily prized by advanced mineral collectors of rare zeolitic or titanosilicate species.

Hardness

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent

mineralrareLabuntsovite Group family

Lepkhenelmite-Zn

Hardness: ~5
Luster: Vitreous
Streak: White
Transparency: Transparent

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Is this lepkhenelmite-zn?

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 lepkhenelmite-zn with a known reference. Lepkhenelmite-Zn sits at Mohs ~5, softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Streak: white.
3
Read the luster
Hold the specimen under a strong light. Luster: vitreous.
4
Match the color range
Compare against the expected color range: pale brown.
5
Look at form & habit
Crystal system: monoclinic. Typical habit: prismatic.

Often confused with

Lepkhenelmite-Zn vs. its common look-alikes, and how to tell them apart in the field.

mineral

Labuntsovite

Mohs 6

How to tell apart: Labuntsovite is the harder of the two (Mohs 6 vs. ~5); luster reads vitreous on Lepkhenelmite-Zn and greasy on Labuntsovite.

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Often found alongside lepkhenelmite-zn

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

All properties

Chemical formula: Ba₂Zn(Ti,Nb)₄(Si₄O₁₂)₂(O,OH)₄·7H₂O
Mohs hardness: ~5
Density: 2.96 g/cm³
Colors: Pale brown
Streak: White
Luster: Vitreous
Transparency: Transparent
Crystal system: Monoclinic
Crystal habit: Prismatic
Cleavage: None
Rarity: Rare
Uses: Collector
Host rock: A late-stage hydrothermal mineral in a complex granitic (eudialite, agerine, feldspar) pegmatite

Where rockhounds find lepkhenelmite-zn

Classic worldwide localities

Pegmatite no. 45, north slope of Mount Lepkhe-Nelʼm, Lovozero massif, Kola peninsula, Russia

Field-hunting tip

Where it forms: A late-stage hydrothermal mineral in a complex granitic (eudialite, agerine, feldspar) pegmatite. If you start seeing lamprophyllite, eudialyte, tsepinite-na in float, you are in the right ground. Typical habit: prismatic. Train your eye for that shape before scanning the outcrop.

Common questions

How do you identify lepkhenelmite-zn?+

Mohs hardness is ~5. Luster: vitreous. The streak is white. Common colors include pale brown.

Where is lepkhenelmite-zn found?+

Notable localities include Pegmatite no. 45, north slope of Mount Lepkhe-Nelʼm, Lovozero massif, Kola peninsula, Russia.

What rocks look like lepkhenelmite-zn?+

Lepkhenelmite-Zn is most often confused with Labuntsovite. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with lepkhenelmite-zn?+

Lepkhenelmite-Zn commonly co-occurs with Lamprophyllite, Eudialyte, Tsepinite-Na, Kuzmenkoite-Zn, Paratsepinite-Ba. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does lepkhenelmite-zn form in?+

Where it forms: A late-stage hydrothermal mineral in a complex granitic (eudialite, agerine, feldspar) pegmatite. Working float back to the host body is the standard way to chase a fresh occurrence.

What is lepkhenelmite-zn used for?+

Lepkhenelmite-Zn is used in collector.

Find lepkhenelmite-zn on the map

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