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. 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: bronze, light bronze.
5
Look at form & habit
Crystal system: orthorhombic. Typical habit: massive, tabular, twinning common.

Often confused with

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

mineral

Rickardite

Mohs 3.5

How to tell apart: Rickardite is the harder of the two (Mohs 3.5 vs. 1-2).

How to tell apart: Streak differs, so Vulcanite leaves black, Tetradymite leaves pale steel-gray.

Compare →

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: 7.1 g/cm³
Colors: BronzeLight bronze
Streak: Black
Luster: Metallic
Transparency: Opaque
Crystal system: Orthorhombic
Crystal habit: Massive, tabular, twinning common
Cleavage: One direction parallel to the length of the lath-shaped grains; another direction, less prominent, perpendicular to the first
Rarity: Rare
Uses: Collector
Host rock: Intermixed with other tellurides

Where rockhounds find vulcanite

Classic worldwide localities

Good Hope mine, Vulcan, Gunnison Co., Colorado, USA
Byn’govsk Au-Te deposit, Central Ural Mountains, Russia
Iriki mine, Kagoshima Prefecture, Japan
Jabal Sayid deposit, Saudi Arabia

Field-hunting tip

Where it forms: Intermixed with other tellurides. If you start seeing rickardite, tellurium, petzite in float, you are in the right ground. Typical habit: massive, tabular, twinning common. Train your eye for that shape before scanning the outcrop.

Common questions

How do you identify vulcanite?+

Mohs hardness is 1-2. Luster: metallic. The streak is black. Common colors include bronze, light bronze.

Where is vulcanite found?+

Notable localities include Good Hope mine, Vulcan, Gunnison Co., Colorado, USA; Byn’govsk Au-Te deposit, Central Ural Mountains, Russia; Iriki mine, Kagoshima Prefecture, Japan; Jabal Sayid deposit, Saudi Arabia.

Is vulcanite safe to handle?+

Vulcanite contains copper. Vulcanite contains tellurium and copper; handle with care to avoid ingestion or inhalation of dust. Wash hands thoroughly after handling specimens.

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 Rickardite, Tellurium, Petzite, Sylvanite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does vulcanite form in?+

Where it forms: Intermixed with other tellurides. 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.