Hessite is a rare silver telluride mineral often found in low-temperature hydrothermal veins. It is characterized by its dull lead-gray to black color, metallic luster, and high density, often occurring as coatings or fine granular masses associated with other tellurides and native gold.

Hardness

2.5-3

Mohs

Luster

Metallic

Streak

Black

Transparency

Opaque

mineralrareAcanthite Group family

Hessite

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

Is this hessite?

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 hessite with a known reference. Hessite 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. Hessite leaves a black streak.
3
Read the luster
Hold the specimen under a strong light. Hessite typically shows a metallic luster.
4
Match the color range
Compare against the expected color range: lead-gray, iron-black.
5
Look at form & habit
Crystal system: monoclinic. Typical habit: tabular crystals, massive, granular.

Often confused with

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

How to tell apart: Streak differs — Hessite leaves black, Galena leaves lead-gray.

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

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Often found alongside hessite

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

All properties

Chemical formula: Ag₂Te
Mohs hardness: 2.5-3
Density: 8.2-8.5 g/cm³
Colors: Lead-gray Iron-black
Streak: Black
Luster: Metallic
Transparency: Opaque
Crystal system: Monoclinic
Crystal habit: Tabular Crystals, Massive, Granular
Cleavage: Indistinct
Rarity: Rare
Uses: Collector, Ore of Silver
Host rock: Epithermal Hydrothermal Veins
Typical price: $20-150 thumbnail, $200+ cabinet specimen

Where rockhounds find hessite

Classic worldwide localities

Baita Bihor, Romania
Guanajuato, Mexico
Goldfield, Nevada, USA
Crippled Creek, Colorado, USA

Field-hunting tip

Look in epithermal hydrothermal veins country — that is the host setting where hessite typically forms. If you start seeing gold, silver, petzite in float, you are in the right ground. Field specimens usually show a tabular crystals, massive, granular habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify hessite?+

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

Where is hessite found?+

Notable localities include Baita Bihor, Romania; Guanajuato, Mexico; Goldfield, Nevada, USA; Crippled Creek, Colorado, USA.

How much is hessite worth?+

Typical asking prices fall in the range of $20-150 thumbnail, $200+ cabinet specimen. Quality, size, and provenance can move individual specimens well outside that range.

Is hessite safe to handle?+

It contains toxic constituents. Contains tellurium, which can be toxic if ingested or inhaled as dust; handle with care and wash hands after handling. Handle with care, avoid grinding or breathing dust, and store separately.

What rocks look like hessite?+

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

What minerals are found with hessite?+

Hessite commonly co-occurs with Gold, Silver, Petzite, Sylvanite, Galena. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does hessite form in?+

Hessite typically forms in epithermal hydrothermal veins. Working float back to the host body is the standard way to chase a fresh occurrence.

What is hessite used for?+

Hessite is used in collector, ore of silver.

Find hessite on the map

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