Hechtsbergite is a rare bismuth vanadate that forms brown rounded or etched crystals. It occurs in cavities in gneiss. Associated minerals include bismutite, namibite and eulytite. It was first described from Hechtsberg quarry, near Hausach, Black Forest, Germany.

Hardness

4.5

Mohs

Luster

Adamantine

Streak

Yellow

Transparency

Transparent

mineralrareMixite Group family

Hechtsbergite

Hardness: 4.5
Luster: Adamantine
Streak: Yellow
Transparency: Transparent

Is this hechtsbergite?

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 hechtsbergite with a known reference. Hechtsbergite sits at Mohs 4.5, softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Hechtsbergite leaves a yellow streak.
3
Read the luster
Hold the specimen under a strong light. Hechtsbergite typically shows a adamantine luster.
4
Match the color range
Compare against the expected color range: brown.
5
Look at form & habit
Crystal system: monoclinic. Typical habit: rounded or etched crystals.

Often confused with

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

mineral

Mixite

Mohs 3-4

How to tell apart: Streak differs, so Hechtsbergite leaves yellow, Mixite leaves pale bluish green; luster reads adamantine on Hechtsbergite and vitreous on Mixite.

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Often found alongside hechtsbergite

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

All properties

Chemical formula: Bi₂O(VO₄)(OH)
Mohs hardness: 4.5
Density: 6.87 g/cm³
Colors: Brown
Streak: Yellow
Luster: Adamantine
Transparency: Transparent
Crystal system: Monoclinic
Crystal habit: Rounded or Etched Crystals
Cleavage: None
Rarity: Rare
Uses: Collector
Host rock: Hydrothermal Veins in Granite

Where rockhounds find hechtsbergite

Classic worldwide localities

Hechtsberg, Germany
Schwarzwald, Germany

Field-hunting tip

Look in hydrothermal veins in granite country, the host setting where hechtsbergite typically forms. If you start seeing bismutite, quartz, mimetite in float, you are in the right ground. Field specimens usually show a rounded or etched crystals habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify hechtsbergite?+

Mohs hardness is 4.5. It typically shows a adamantine luster. The streak is yellow. Common colors include brown.

Where is hechtsbergite found?+

Notable localities include Hechtsberg, Germany; Schwarzwald, Germany.

Is hechtsbergite safe to handle?+

It contains toxic constituents. Contains vanadium, which is toxic if ingested or inhaled as dust. Wash hands thoroughly after handling and avoid creating dust. Handle with care, avoid grinding or breathing dust, and store separately.

What rocks look like hechtsbergite?+

Hechtsbergite is most often confused with Mixite. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with hechtsbergite?+

Hechtsbergite commonly co-occurs with Bismutite, Quartz, Mimetite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does hechtsbergite form in?+

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

What is hechtsbergite used for?+

Hechtsbergite is used in collector.

Find hechtsbergite on the map

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