Briartite is a rare sulfide mineral primarily found in specific hydrothermal deposits like the Tsumeb mine. It typically occurs as small, steel-gray massive grains intergrown with other germanium-bearing sulfides, making it difficult to distinguish without X-ray diffraction or electron microprobe analysis.

Hardness

3-3.5

Mohs

Luster

Metallic

Streak

Black

Transparency

Opaque

mineralrare

Briartite

Hardness: 3-3.5
Luster: Metallic
Streak: Black
Transparency: Opaque

Is this briartite?

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 briartite with a known reference. Briartite sits at Mohs 3-3.5 — softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Briartite leaves a black streak.
3
Read the luster
Hold the specimen under a strong light. Briartite typically shows a metallic luster.
4
Match the color range
Compare against the expected color range: steel-gray, grayish-white.
5
Look at form & habit
Crystal system: tetragonal. Typical habit: massive, anhedral grains.

Often confused with

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

mineral

Sphalerite

Mohs 3.5-4

How to tell apart: Streak differs — Briartite leaves black, Sphalerite leaves white to yellow-brown; luster reads metallic on Briartite and resinous to submetallic on Sphalerite.

Often found alongside briartite

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

All properties

Chemical formula: Cu₂ZnGeS₄
Mohs hardness: 3-3.5
Density: 4.56 g/cm³
Colors: Steel-gray Grayish-white
Streak: Black
Luster: Metallic
Transparency: Opaque
Crystal system: Tetragonal
Crystal habit: Massive, Anhedral Grains
Cleavage: None
Rarity: Rare
Uses: Collector
Host rock: Hydrothermal Polymetallic Deposits
Typical price: $50-300 per specimen

Where rockhounds find briartite

Classic worldwide localities

Tsumeb Mine, Namibia
Kipushi Mine, DR Congo

Field-hunting tip

Look in hydrothermal polymetallic deposits country — that is the host setting where briartite typically forms. If you start seeing germanite, sphalerite, galena in float, you are in the right ground. Field specimens usually show a massive, anhedral grains habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify briartite?+

Mohs hardness is 3-3.5. It typically shows a metallic luster. The streak is black. Common colors include steel-gray, grayish-white.

Where is briartite found?+

Notable localities include Tsumeb Mine, Namibia; Kipushi Mine, DR Congo.

How much is briartite 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 briartite safe to handle?+

It contains toxic constituents. Contains germanium and sulfur; avoid inhalation of dust when cutting or polishing, and wash hands thoroughly after handling. Handle with care, avoid grinding or breathing dust, and store separately.

What rocks look like briartite?+

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

What minerals are found with briartite?+

Briartite commonly co-occurs with Germanite, Sphalerite, Galena, Pyrite, Renierite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does briartite form in?+

Briartite typically forms in hydrothermal polymetallic deposits. Working float back to the host body is the standard way to chase a fresh occurrence.

What is briartite used for?+

Briartite is used in collector.

Find briartite on the map

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