Oosterboschite is an exceptionally rare palladium-copper selenide mineral found in the oxidation zones of specific cobalt-copper deposits. It typically occurs as microscopic grains embedded within larger mineral masses, requiring professional micro-analysis for definitive identification.

Hardness

4.5-5

Mohs

Luster

Metallic

Streak

Black

Transparency

Opaque

mineralrare

Oosterboschite

Hardness: 4.5-5
Luster: Metallic
Streak: Black
Transparency: Opaque

Is this oosterboschite?

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 oosterboschite with a known reference. Oosterboschite sits at Mohs 4.5-5, softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Streak: black.
3
Read the luster
Hold the specimen under a strong light. Luster: metallic.
4
Match the color range
Compare against the expected color range: black.
5
Look at form & habit
Crystal system: orthorhombic. Typical habit: anhedral grains, microscopic crystals.

Often confused with

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

mineral

Trogtalite

Mohs ~7

How to tell apart: Trogtalite is the harder of the two (Mohs ~7 vs. 4.5-5).

Often found alongside oosterboschite

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

All properties

Chemical formula: (Pd,Cu)₇Se₅
Mohs hardness: 4.5-5
Density: 8.48 g/cm³
Colors: Black
Streak: Black
Luster: Metallic
Transparency: Opaque
Crystal system: Orthorhombic
Crystal habit: Anhedral grains, microscopic crystals
Cleavage: None
Rarity: Rare
Uses: Collector, Research
Host rock: In the zone of oxidation (Musonoi mine, Congo)

Where rockhounds find oosterboschite

Classic worldwide localities

Musonoi Cu–Co mine, near Kolwezi, Katanga Province, Congo (Shaba Province, Zaire) (type locality)
Copper Hills prospect, East Pilbara region, Western Australia
Hope’s Nose, Torquay, Devon, England

Field-hunting tip

Where it forms: In the zone of oxidation (Musonoi mine, Congo). If you start seeing verbeekite, trogtalite, selenian digenite in float, you are in the right ground. Typical habit: anhedral grains, microscopic crystals. Train your eye for that shape before scanning the outcrop.

Common questions

How do you identify oosterboschite?+

Mohs hardness is 4.5-5. Luster: metallic. The streak is black. Common colors include black.

Where is oosterboschite found?+

Notable localities include Musonoi Cu–Co mine, near Kolwezi, Katanga Province, Congo (Shaba Province, Zaire) (type locality); Copper Hills prospect, East Pilbara region, Western Australia; Hope’s Nose, Torquay, Devon, England.

Is oosterboschite safe to handle?+

Oosterboschite contains copper and selenium. Contains selenium, which can be toxic if ingested or inhaled as dust; handle with care and wash hands after handling.

What rocks look like oosterboschite?+

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

What minerals are found with oosterboschite?+

Oosterboschite commonly co-occurs with Verbeekite, Trogtalite, Selenian digenite, Covellite, Gold, Chrisstanleyite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does oosterboschite form in?+

Where it forms: In the zone of oxidation (Musonoi mine, Congo). Working float back to the host body is the standard way to chase a fresh occurrence.

What is oosterboschite used for?+

Oosterboschite is used in collector, research.

Find oosterboschite on the map

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