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 — Dzierżanowskite leaves black, Chalcocite leaves lead-gray to black.

How to tell apart: Streak differs — 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
Typical price: n/a

Where rockhounds find dzierżanowskite

Classic worldwide localities

Kupferschiefer deposit, Poland
Rudna mine, Poland

Field-hunting tip

Look in sedimentary copper deposits country — that is 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.

How much is dzierżanowskite worth?+

Typical asking prices fall in the range of n/a. Quality, size, and provenance can move individual specimens well outside that range.

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.