Kuzmenkoite-Zn is a rare member of the labuntsovite group typically found in highly evolved alkaline pegmatite environments. It forms small, attractive prismatic crystals, often exhibiting a honey-yellow or brownish-orange color and a vitreous luster.

Hardness

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent

mineralrareLabuntsovite Group family

Kuzmenkoite-Zn

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

No image

Is this kuzmenkoite-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 kuzmenkoite-zn with a known reference. Kuzmenkoite-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: colorless, white, grayish white, pale pink, light brown.
5
Look at form & habit
Crystal system: monoclinic. Typical habit: prismatic, pseudomorphous.

Often confused with

Kuzmenkoite-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 Kuzmenkoite-Zn and greasy on Labuntsovite.

Often found alongside kuzmenkoite-zn

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

All properties

Chemical formula: K₂ZnTi₄(Si₄O₁₂)₂(OH,O)₄·nH₂O
Mohs hardness: 5
Density: 2.78-2.87 g/cm³
Colors: Colorless White Grayish white Pale pink Light brown
Streak: White
Luster: Vitreous
Transparency: Transparent
Crystal system: Monoclinic
Crystal habit: Prismatic, pseudomorphous
Cleavage: None
Rarity: Rare
Uses: Collector
Host rock: Hydrothermal product in 3 pegmatites

Where rockhounds find kuzmenkoite-zn

Classic worldwide localities

Mount Kedydverpakhk and Mount Krrnasurt, Lovozero massif, Kola Peninsula, Russia (type locality)

Field-hunting tip

Where it forms: Hydrothermal product in 3 pegmatites. If you start seeing aegirine, microcline, nepheline in float, you are in the right ground. Typical habit: prismatic, pseudomorphous. Train your eye for that shape before scanning the outcrop.

Common questions

How do you identify kuzmenkoite-zn?+

Mohs hardness is 5. Luster: vitreous. The streak is white. Common colors include colorless, white, grayish white, pale pink.

Where is kuzmenkoite-zn found?+

Notable localities include Mount Kedydverpakhk and Mount Krrnasurt, Lovozero massif, Kola Peninsula, Russia (type locality).

What rocks look like kuzmenkoite-zn?+

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

What minerals are found with kuzmenkoite-zn?+

Kuzmenkoite-Zn commonly co-occurs with Aegirine, Microcline, Nepheline, Arfvedsonite. Spotting any of these in float or country rock is a useful trip signal.

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

Where it forms: Hydrothermal product in 3 pegmatites. Working float back to the host body is the standard way to chase a fresh occurrence.

What is kuzmenkoite-zn used for?+

Kuzmenkoite-Zn is used in collector.

Find kuzmenkoite-zn on the map

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