Vulcanite is a rare copper telluride mineral that typically appears as metallic, steel-gray to bronze-colored platy crystals or masses. It is most famous for its occurrences in epithermal gold-telluride deposits, often forming alongside other rare tellurium minerals. Collectors look for its distinctive metallic luster and association with characteristic telluride-bearing host rocks.

Hardness

1-2

Mohs

Luster

Metallic

Streak

Black

Transparency

Opaque

mineralrare

Vulcanite

Hardness: 1-2
Luster: Metallic
Streak: Black
Transparency: Opaque

Is this vulcanite?

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 vulcanite with a known reference. Vulcanite sits at Mohs 1-2 — softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Vulcanite leaves a black streak.
3
Read the luster
Hold the specimen under a strong light. Vulcanite typically shows a metallic luster.
4
Match the color range
Compare against the expected color range: steel-gray, black, bronze.
5
Look at form & habit
Crystal system: orthorhombic. Typical habit: platy crystals, granular, massive.

Often confused with

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

How to tell apart: Streak differs — Vulcanite leaves black, Tetradymite leaves lead-gray.

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Often found alongside vulcanite

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

All properties

Chemical formula: CuTe
Mohs hardness: 1-2
Density: 5.78 g/cm³
Colors: Steel-gray Black Bronze
Streak: Black
Luster: Metallic
Transparency: Opaque
Crystal system: Orthorhombic
Crystal habit: Platy Crystals, Granular, Massive
Cleavage: Perfect
Rarity: Rare
Uses: Collector
Host rock: Epithermal Gold-telluride Deposits
Typical price: $50-300 per specimen

Where rockhounds find vulcanite

Classic worldwide localities

Vulcan Mine, Colorado, USA
Moctezuma, Sonora, Mexico
Kawazu Mine, Japan

Field-hunting tip

Look in epithermal gold-telluride deposits country — that is the host setting where vulcanite typically forms. If you start seeing tellurium, rickardite, pyrite in float, you are in the right ground. Field specimens usually show a platy crystals, granular, massive habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify vulcanite?+

Mohs hardness is 1-2. It typically shows a metallic luster. The streak is black. Common colors include steel-gray, black, bronze.

Where is vulcanite found?+

Notable localities include Vulcan Mine, Colorado, USA; Moctezuma, Sonora, Mexico; Kawazu Mine, Japan.

How much is vulcanite worth?+

Typical asking prices fall in the range of $50-300 per specimen. Quality, size, and provenance can move individual specimens well outside that range.

Is vulcanite safe to handle?+

It contains toxic constituents. Vulcanite contains tellurium and copper; handle with care to avoid ingestion or inhalation of dust. Wash hands thoroughly after handling specimens. Handle with care, avoid grinding or breathing dust, and store separately.

What rocks look like vulcanite?+

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

What minerals are found with vulcanite?+

Vulcanite commonly co-occurs with Tellurium, Rickardite, Pyrite, Quartz. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does vulcanite form in?+

Vulcanite typically forms in epithermal gold-telluride deposits. Working float back to the host body is the standard way to chase a fresh occurrence.

What is vulcanite used for?+

Vulcanite is used in collector.

Find vulcanite on the map

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