• Chemistry: Pb3As4S9, Lead Arsenic Sulfide
  • Class: Sulfides
  • Subclass: Sulfosalts
  • Uses: As a very minor ore of lead and arsenic and as mineral specimens.
  • Specimens

Baumhauerite is a rare sulfide mineral from the famous quarry at Lengenbach, Binnental, Valais, Switzerland. The site is famous for many rare minerals including: novakite, rathite, smythite, dufrenoysite, jordanite, marrite, seligmannite, wallisite, lengenbachite, bernardite, sartorite, arsenolamprite, liveingite, imhofite and hatchite to name a few. Most of the more exotic minerals from this site are arsenic sulfides and sulfosalts like baumhauerite. Baumhauerite is usually a bright dark gray mineral with a nice luster and striated prismatic crystals embedded in a dolomitic marble. It is a rare mineral and is only found in a few localities. Lengenbach is the only locality where specimens can be found with regularity.


  • Color is a bright lead gray, blue gray to gray black (internal reflections will flash a red color).
  • Luster is metallic to dull.
  • Transparency: Crystals are opaque.
  • Crystal System: Triclinic; bar 1.
  • Crystal Habits include prismatic striated crystals with rounded faces; also in massive and granular forms.
  • Cleavage: Indistinct.
  • Fracture: Conchoidal.
  • Hardness is 3.
  • Specific Gravity is 5.3 (slightly heavier than average for metallic minerals)
  • Streak is dark brown.
  • Associated Minerals include dolomite, realgar and sartorite.
  • Notable Occurrences are limited to the type locality of the Lengenbach Quarry, Binnental, Valais, Switzerland and Franklin, New Jersey, USA.
  • Best Field Indicators are crystal habit, locality, internal reflections, associations and density.
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BAUMHAUERITE specimen bau-1
$ 48.00
Dims:1.4x0.7x0.7" (3.6x1.8x1.8 cm)
Wt: 0.8oz. (22g)
La Libertad Mine, Quiruvilca, Peru
Protruding from the hydrothermal vein-matrix of this specimen are several tiny crystals of baumhauerite. These crystals are too small to readily observe the triclinic form of this mineral, but the characteristic striations are clearly visible. There appears to be no damage to this specimen.
no photo
bau-1 ($ 48.00)
La Libertad Mine, Quiruvilca, Peru


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