Baumhauerite-2a Mineral Data

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General Baumhauerite-2a Information

Chemical Formula:

Pb3As4S9

Composition:

Molecular Weight = 1,209.88 gm

Arsenic 24.77 % As

Lead 51.38 % Pb

Sulfur 23.85 % S

______

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

Baumhauerite-2a Image

Images:

Click Here for Larger Baumhauerite-2a Image

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

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: Unk

Physical Properties of Baumhauerite-2a

Color:

Steel gray.

Diaphaneity:

Opaque

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Hardness:

3 - Calcite

Luster:

Metallic

Streak:

reddish brown

Calculated Properties of Baumhauerite-2a

Fermion Index:

Fermion Index = 0.11
Boson Index = 0.89

Photoelectric:

PE_{Baumhauerite-2a}= 933.98 barns/electron
U=PE_{Baumhauerite-2a} x rElectron Density= . barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Baumhauerite-2a is Not Radioactive

Baumhauerite-2a Classification

Dana Class:

03.06.13.02 (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

03.06.13.01 Baumhauerite Pb3As4S9 P1 1

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

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

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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Ask about Baumhauerite-2a here :
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Print or Cut-and-Paste your Baumhauerite-2a Specimen Label here :

Baumhauerite-2a

Pb3As4S9
Dana No: 03.06.13.02 Strunz No: 02.HC.05b
Locality:

Notes: