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, so 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, 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.