Moncheite is a rare platinum group telluride mineral that typically occurs as microscopic inclusions within massive sulfide ore bodies. Collectors usually find this mineral as part of polished ore assemblages from major platinum-producing districts like the Stillwater or Bushveld complexes. Identification generally requires microscopic study or chemical analysis due to its small grain size and similarity to other platinum-group sulfides.

Hardness

2.5-3

Mohs

Luster

Metallic

Streak

Black

Transparency

Opaque

mineralrarePlatinum Group Minerals family

Moncheite

Hardness: 2.5-3
Luster: Metallic
Streak: Black
Transparency: Opaque

Is this moncheite?

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 moncheite with a known reference. Moncheite sits at Mohs 2.5-3 — softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Moncheite leaves a black streak.
3
Read the luster
Hold the specimen under a strong light. Moncheite typically shows a metallic luster.
4
Match the color range
Compare against the expected color range: white, tin-white.
5
Look at form & habit
Crystal system: trigonal. Typical habit: tabular crystals, grains, or inclusions in other sulfides.

Often confused with

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

How to tell apart: Streak differs — Moncheite leaves black, Merenskyite leaves grey.

How to tell apart: Sperrylite is the harder of the two (Mohs 6-7 vs. 2.5-3).

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Often found alongside moncheite

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

All properties

Chemical formula: (Pt,Pd)(Te,Bi)₂
Mohs hardness: 2.5-3
Density: 9.4-9.8 g/cm³
Colors: White Tin-white
Streak: Black
Luster: Metallic
Transparency: Opaque
Crystal system: Trigonal
Crystal habit: Tabular Crystals, Grains, Or Inclusions in Other Sulfides
Cleavage: Perfect
Rarity: Rare
Uses: Collector, Scientific Research
Host rock: Mafic and Ultramafic Igneous Rocks, Hydrothermal Sulfide Deposits
Typical price: $50-300 per small specimen

Where rockhounds find moncheite

Classic worldwide localities

Monchegorsk district, Russia
Stillwater Complex, USA
Bushveld Complex, South Africa
Lac des Iles, Canada

Field-hunting tip

Look in mafic and ultramafic igneous rocks, hydrothermal sulfide deposits country — that is the host setting where moncheite typically forms. If you start seeing chalcopyrite, pentlandite, pyrrhotite in float, you are in the right ground. Field specimens usually show a tabular crystals, grains, or inclusions in other sulfides habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify moncheite?+

Mohs hardness is 2.5-3. It typically shows a metallic luster. The streak is black. Common colors include white, tin-white.

Where is moncheite found?+

Notable localities include Monchegorsk district, Russia; Stillwater Complex, USA; Bushveld Complex, South Africa; Lac des Iles, Canada.

How much is moncheite worth?+

Typical asking prices fall in the range of $50-300 per small specimen. Quality, size, and provenance can move individual specimens well outside that range.

Is moncheite safe to handle?+

It contains toxic constituents. Contains tellurium and potentially other heavy metals; handle with care and wash hands thoroughly after contact. Handle with care, avoid grinding or breathing dust, and store separately.

What rocks look like moncheite?+

Moncheite is most often confused with Merenskyite, Kotulskite, Sperrylite. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with moncheite?+

Moncheite commonly co-occurs with Chalcopyrite, Pentlandite, Pyrrhotite, Magnetite, Cooperite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does moncheite form in?+

Moncheite typically forms in mafic and ultramafic igneous rocks, hydrothermal sulfide deposits. Working float back to the host body is the standard way to chase a fresh occurrence.

What is moncheite used for?+

Moncheite is used in collector, scientific research.

Find moncheite on the map

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