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, so Hessite leaves black, Galena leaves lead-gray.

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

Compare →

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, 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.