Cuproneyite is a rare copper-lead-bismuth selenide mineral known for its dark, metallic luster and occurrence in seleniferous hydrothermal deposits. It is typically found in massive forms or as microscopic inclusions within other sulfide minerals, making it a challenging mineral for general collectors to identify without analytical testing.

Hardness

Mohs

Luster

Metallic

Transparency

Opaque

mineralrare

Cuproneyite

Hardness: ~3
Luster: Metallic
Transparency: Opaque

No image

Is this cuproneyite?

4-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 cuproneyite with a known reference. Cuproneyite sits at Mohs ~3, softer than the next harder reference, harder than the previous one.
2
Read the luster
Hold the specimen under a strong light. Luster: metallic.
3
Match the color range
Compare against the expected color range: silver-gray.
4
Look at form & habit
Crystal system: monoclinic. Typical habit: massive, crusts, acicular.

Often confused with

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

Often found alongside cuproneyite

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

All properties

Chemical formula: Cu₇Pb₂₇Bi₂₅S₆₈
Mohs hardness: ~3
Density: 7.113 g/cm³
Colors: Silver-gray
Luster: Metallic
Transparency: Opaque
Crystal system: Monoclinic
Crystal habit: Massive, crusts, acicular
Cleavage: Perfect along [001]
Rarity: Rare
Uses: Collector
Host rock: In diopside skarn hosting polymetallic mineralization related to contact metamorphism

Where rockhounds find cuproneyite

Classic worldwide localities

Băiţa Bihor, Romania

Field-hunting tip

Where it forms: In diopside skarn hosting polymetallic mineralization related to contact metamorphism. If you start seeing cosalite, hammarite-friedrichite, calcite in float, you are in the right ground. Typical habit: massive, crusts, acicular. Train your eye for that shape before scanning the outcrop.

Common questions

How do you identify cuproneyite?+

Mohs hardness is ~3. Luster: metallic. Common colors include silver-gray.

Where is cuproneyite found?+

Notable localities include Băiţa Bihor, Romania.

Is cuproneyite safe to handle?+

Cuproneyite contains copper and lead. Contains lead, selenium, and copper; wash hands after handling and avoid inhaling dust.

What rocks look like cuproneyite?+

Cuproneyite is most often confused with Galena, Wittichenite, Tetrahedrite. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with cuproneyite?+

Cuproneyite commonly co-occurs with Cosalite, Hammarite-friedrichite, Calcite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does cuproneyite form in?+

Where it forms: In diopside skarn hosting polymetallic mineralization related to contact metamorphism. Working float back to the host body is the standard way to chase a fresh occurrence.

What is cuproneyite used for?+

Cuproneyite is used in collector.

Find cuproneyite on the map

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