Dzierżanowskite is a rare silver-copper sulfide mineral discovered in the Kupferschiefer deposits of Poland. It typically occurs as microscopic inclusions within other sulfide minerals, making it a challenging species for collectors to identify without professional analytical equipment.

Hardness

2.5-3

Mohs

Luster

Metallic

Streak

Black

Transparency

Opaque

mineralrare

Dzierżanowskite

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

No image

Is this dzierżanowskite?

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 dzierżanowskite with a known reference. Dzierżanowskite 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. Dzierżanowskite leaves a black streak.
3
Read the luster
Hold the specimen under a strong light. Dzierżanowskite typically shows a metallic luster.
4
Match the color range
Compare against the expected color range: gray.
5
Look at form & habit
Crystal system: tetragonal. Typical habit: anhedral to subhedral grains.

Often confused with

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

mineral

Chalcocite

Mohs 2.5-3

How to tell apart: Streak differs, so Dzierżanowskite leaves black, Chalcocite leaves lead-gray to black.

How to tell apart: Streak differs, so Dzierżanowskite leaves black, Stromeyerite leaves dark gray.

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Often found alongside dzierżanowskite

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

All properties

Chemical formula: Ag₂CuS₂
Mohs hardness: 2.5-3
Density: 6.1-6.2 g/cm³
Colors: Gray
Streak: Black
Luster: Metallic
Transparency: Opaque
Crystal system: Tetragonal
Crystal habit: Anhedral to Subhedral Grains
Cleavage: None
Rarity: Rare
Uses: Collector
Host rock: Sedimentary Copper Deposits

Where rockhounds find dzierżanowskite

Classic worldwide localities

Kupferschiefer deposit, Poland
Rudna mine, Poland

Field-hunting tip

Look in sedimentary copper deposits country, the host setting where dzierżanowskite typically forms. If you start seeing chalcocite, bornite, galena in float, you are in the right ground. Field specimens usually show a anhedral to subhedral grains habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify dzierżanowskite?+

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

Where is dzierżanowskite found?+

Notable localities include Kupferschiefer deposit, Poland; Rudna mine, Poland.

Is dzierżanowskite safe to handle?+

It contains toxic constituents. Contains copper and silver; handle with care and wash hands after handling to avoid ingestion of fine particles. Handle with care, avoid grinding or breathing dust, and store separately.

What rocks look like dzierżanowskite?+

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

What minerals are found with dzierżanowskite?+

Dzierżanowskite commonly co-occurs with Chalcocite, Bornite, Galena, Pyrite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does dzierżanowskite form in?+

Dzierżanowskite typically forms in sedimentary copper deposits. Working float back to the host body is the standard way to chase a fresh occurrence.

What is dzierżanowskite used for?+

Dzierżanowskite is used in collector.

Find dzierżanowskite on the map

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