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Baumhauerite-2a Mineral Data
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General Baumhauerite-2a Information
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 Chemical Formula: |
Pb3As4S9 |
| Composition: |
Molecular Weight = 1,209.88 gm |
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Arsenic 24.77 % As |
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Lead 51.38 % Pb |
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Sulfur 23.85 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Pb3As4S9 |
| IMA Status: |
Approved IMA 1990 (Dana # Added) |
| Locality: |
Link to MinDat.org Location Data. |
| Name Origin: |
Named as the monoclinic polymorph of baumhauerite. |
| Name Pronunciation: |
Baumhauerite-2a + Pronunciation  |
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Baumhauerite-2a Image |
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Images:
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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 |
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Baumhauerite-2a Crystallography
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| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: Unk |
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Physical Properties of Baumhauerite-2a
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| Color: |
Steel gray. |
| Diaphaneity: |
Opaque |
| Habit: |
Crystalline - Fine - Occurs as well-formed fine sized crystals. |
| Hardness: |
3 - Calcite |
| Luster: |
Metallic |
| Streak: |
reddish brown |
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Calculated Properties of Baumhauerite-2a
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| Fermion Index: |
Fermion Index = 0.11
Boson Index = 0.89 |
| Photoelectric: |
PEBaumhauerite-2a = 933.98 barns/electron
U=PEBaumhauerite-2a x rElectron Density= . barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Baumhauerite-2a is Not Radioactive |
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Baumhauerite-2a Classification
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| Dana Class: |
03.06.13.02 (03)Sulfides - Sulfosalts |
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(03.06)where 2 < z/y < 2.49 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.06.13)Dana Group |
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03.06.13.01 Baumhauerite Pb3As4S9 P1 1 |
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03.06.13.02 Baumhauerite-2a! Pb3As4S9 Unk 2/m |
| Strunz Class: |
02.HC.05b 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.H - Sulfosalts of SnS Archetype |
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02.HC -With only Pb |
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02.HC.05b Baumhauerite Pb3As4S9 P1 1 |
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02.HC.05b Baumhauerite-2a! Pb3As4S9 Unk 2/m |
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Other Baumhauerite-2a Information
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| 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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Print or Cut-and-Paste your Baumhauerite-2a Specimen Label here :
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Baumhauerite-2a
Pb3As4S9
Dana No: 03.06.13.02 Strunz No: 02.HC.05b
Locality:
Notes:
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