Mineralogy Database

Baumstarkite Mineral Data

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General Baumstarkite Information

Help on Chemical  Formula: Chemical Formula: Ag3(Sb,As)2SbS6
Help on Composition: Composition: Molecular Weight = 869.54 gm
   Silver    37.22 %  Ag
   Antimony  38.50 %  Sb
   Arsenic    2.15 %  As
   Sulfur    22.13 %  S
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: Ag3Sb2.75As0.25S6
Help on Environment: Environment: Found coating miargyrite. Polymorphic relationship with miargyrite and cuboargyrite
Help on IMA Status: IMA Status: Approved IMA 2002 (Dana # Added)
Help on Locality: Locality: San Genaro mine, Huancavelica Department, Peru. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Manfred Baumstark(1954-), German mineralogist who first recognized the mineral.
Help on Synonym: Synonym: IMA1999-049
 

Baumstarkite Image

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  Baumstarkite

Comments: Fragments of baumstarkite with zoning of darker lamellae with higher As content. (AmMin 87:755).
Location: San Genaro mine, Huancavelica Department, Peru.. Scale: See Image.
© American Mineralogist

Baumstarkite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9331:1:1.0591
Help on Cell Dimensions: Cell Dimensions: a = 7.766, b = 8.322, c = 8.814, Z = 2; alpha = 100.62°, beta = 104.03°, gamma = 90.22° V = 543.17 Den(Calc)= 5.32
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.798(1)(003), 2.841(0.88)(221,221), 3.158(0.8)(201), 3.425(0.8)(021), 1.3994(0.6)(006), 3.224(0.6)(202), 1.971(0.5)(224), 2.013(0.5)(222), 3.258(0.3)(02<
Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

Keyboard
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I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
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Help on Above

Forms: ( 0 1 1) ( 0 1 0) ( 1 0 1) ( 2 0 1) ( 1 0 0) ( 0 0 1)

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Physical Properties of Baumstarkite

Help on Cleavage: Cleavage: {001} Perfect, {100} Good
Help on Color: Color: Iron black, Grayish black.
Help on Density: Density: 5.33
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Metallic
Help on Streak: Streak: grayish black
 

Optical Properties of Baumstarkite

Help on Optical Data: Optical Data: NCalc= 1.36 - from Gladstone-Dale relationship (KC = 0.0672) where Ncalc=Dcalc*KC+1
NCalc= 1.36 - from Gladstone-Dale relationship (KC = 0.0672) where Ncalc=Dmeas*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Strong to weak.
Help on RL Bireflectance: RL Bireflectance: Weak to moderate.
Help on RL Color: RL Color: Gray to white.
Help on RL Pleochroism: RL Pleochroism: None.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Baumstarkite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   33.15   40.95 
   
 420 nm   32.70   40.75 
 440 nm   32.15   40.20 
 460 nm   31.60   39.65 
 480 nm   31.10   39.50 
 500 nm   30.40   38.80 
 520 nm   29.95   38.10 
 540 nm   29.35   37.40 
 560 nm   28.60   36.80 
 580 nm   28.10   36.45 
 600 nm   27.60   35.70 
 620 nm   27.05   34.65 
 640 nm   26.45   33.60 
 660 nm   25.90   32.70 
 680 nm   25.45   32.40 
 700 nm   25.15   31.25 
Standardized Intensity (100%) Reflection Spectra of Baumstarkite in Oil
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   19.20   25.95 
   
 420 nm   18.40   25.25 
 440 nm   17.60   24.30 
 460 nm   17.00   23.80 
 480 nm   16.40   23.30 
 500 nm   15.80   22.60 
 520 nm   15.25   21.80 
 540 nm   14.70   21.30 
 560 nm   14.10   20.75 
 580 nm   13.65   20.50 
 600 nm   13.20   19.80 
 620 nm   12.80   18.85 
 640 nm   12.30   17.90 
 660 nm   11.95   17.25 
 680 nm   11.75   16.60 
 700 nm   11.70   16.30 
Calculated Relative Intensity Colors of Baumstarkite in Air
Relative
Intensity
   0%   40%   80% 100% 120% 160% 200% 240% 280% 320%
R1                    
R2                    
Calculated Relative Intensity Colors of Baumstarkite in Oil
Relative
Intensity
   0%   70% 100% 140% 210% 280% 350% 420% 490% 560% 630% 660%
R1                        
R2                        
 

Calculated Properties of Baumstarkite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.72 gm/cc
note: Specific Gravity of Baumstarkite =5.32 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0016594569
Boson Index = 0.9983405431
Help on Photoelectric: Photoelectric: PEBaumstarkite = 226.23 barns/electron
U=PEBaumstarkite x rElectron Density=1,067.14 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Baumstarkite is Not Radioactive
 

Baumstarkite Classification

Help on  Dana Class: Dana Class: 03.07.04.02 (03)Sulfides - Sulfosalts
  (03.07)where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.07.04)Dana Group
 
03.07.04.01 Aramayoite Ag3Sb2(Sb,Bi)S6 P1 1
 
03.07.04.02 Baumstarkite! Ag3(Sb,As)2SbS6 P1 1
Help on  Strunz Class: Strunz Class: 02.HA.25 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.H - Sulfosalts of SnS Archetype
  02.HA -With Cu, Ag, Fe (without Pb)
 
02.HA.25 Aramayoite Ag3Sb2(Sb,Bi)S6 P1 1
 
02.HA.25 Baumstarkite! Ag3(Sb,As)2SbS6 P1 1
 

Other Baumstarkite Information

Help on References: References: NAME( AmMin, Vol 87, p 735) PHYS. PROP.(AmMin, Vol 87, p 735) OPTIC PROP.(AmMin, Vol 87, p 735)
Help on See Also: See Also: Links to other databases for Baumstarkite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Baumstarkite

Ag3(Sb,As)2SbS6
Dana No: 03.07.04.02 Strunz No: 02.HA.25
Locality:

 

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