Mineralogy Database

Baumhauerite-2a Mineral Data

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General Baumhauerite-2a Information

Help on Chemical  Formula: Chemical Formula: Pb3As4S9
Help on Composition: Composition: Molecular Weight = 1,209.88 gm
   Arsenic  24.77 %  As
   Lead     51.38 %  Pb
   Sulfur   23.85 %  S
           100.00 % 
Help on Empirical Formula: Empirical Formula: Pb3As4S9
Help on IMA Status: IMA Status: Approved IMA 1990 (Dana # Added)
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the monoclinic polymorph of baumhauerite.
Help on Name Pronunciation: Name Pronunciation: Baumhauerite-2a + Pronunciation Say BAUMHAUERITE-2A

Baumhauerite-2a Image

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  Baumhauerite-2a   Sphalerite

Comments: Dark crystal of baumhauerite-2a (same shape as baumhauerite) with olive-green transparent sphalerite crystal on white dolomite.
Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Picture 2 cm tall.
© Walter Gabriel

Baumhauerite-2a Crystallography

Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: Unk

Physical Properties of Baumhauerite-2a

Help on Color: Color: Steel gray.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Metallic
Help on Streak: Streak: reddish brown

Calculated Properties of Baumhauerite-2a

Help on Fermion Index: Fermion Index: Fermion Index = 0.11
Boson Index = 0.89
Help on Photoelectric: Photoelectric: PEBaumhauerite-2a = 933.98 barns/electron
U=PEBaumhauerite-2a x rElectron Density= . barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Baumhauerite-2a is Not Radioactive

Baumhauerite-2a Classification

Help on  Dana Class: Dana Class: (03)Sulfides - Sulfosalts
  (03.06)where 2 < z/y < 2.49 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.06.13)Dana Group Baumhauerite Pb3As4S9 P1 1 Baumhauerite-2a! Pb3As4S9 Unk 2/m
Help on  Strunz Class: Strunz Class: 02.HC.05b 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.H - Sulfosalts of SnS Archetype
  02.HC -With only Pb
02.HC.05b Baumhauerite Pb3As4S9 P1 1
02.HC.05b Baumhauerite-2a! Pb3As4S9 Unk 2/m

Other Baumhauerite-2a Information

Help on See Also: See Also: Links to other databases for Baumhauerite-2a :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Dana No: Strunz No: 02.HC.05b