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, so 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, 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.