Mineralogy Database

Aschamalmite Mineral Data

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General Aschamalmite Information

Help on Chemical  Formula: Chemical Formula: Pb6Bi2S9
Help on Composition: Composition: Molecular Weight = 1,949.75 gm
   Bismuth  21.44 %  Bi
   Lead     63.76 %  Pb
   Sulfur   14.80 %  S
           100.00 % 
Help on Empirical Formula: Empirical Formula: Pb6Bi2S9
Help on Environment: Environment: In alpine cleft veins, cutting gneiss.
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: Ascham Alm, Untersulzbachtal, Austria. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Aschamalmite + Pronunciation Say ASCHAMALMITE
Help on Synonym: Synonym: Beegerite

Aschamalmite Image

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Comments: Black metallic blades of aschamalmite associated with beige rhombic siderite.
Location: Costabella, Osiglia, SV, Italy. Scale: Crystal Size: 1 mm.
© Carlo Guidarin

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Comments: Lead gray metallic prismatic aschamalmite crystals in veins in quartz.
Location: Ascham Alp, Untersulzbach Valley, Salzburg, Austria. Scale: See Image.
© Rruff Database

Aschamalmite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =3.352:1:7.6845
Help on Cell Dimensions: Cell Dimensions: a = 13.71, b = 4.09, c = 31.43, Z = 4; beta = 91° V = 1,762.13 Den(Calc)= 7.35
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.426(1), 3.378(0.88), 2.941(0.54),

Physical Properties of Aschamalmite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Lead gray, Gray.
Help on Density: Density: 7.27
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Metallic
Help on Magnetism: Magnetism: Nonmagnetic

Optical Properties of Aschamalmite

Help on RL Anisotrophism: RL Anisotrophism: Moderate, from gray to red-brown.
Help on RL Color: RL Color: Creamy white.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Aschamalmite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   48.80   44.10 
 420 nm   48.20   43.50 
 440 nm   47.50   43.00 
 460 nm   46.70   42.50 
 480 nm   46.40   42.10 
 500 nm   45.80   41.70 
 520 nm   44.80   41.10 
 540 nm   44.30   40.50 
 546 nm   44.00   40.10 
 560 nm   43.90   40.00 
 580 nm   43.80   39.70 
 589 nm   43.50   39.40 
 600 nm   43.50   39.30 
 620 nm   43.30   39.00 
 640 nm   43.20   38.80 
 650 nm   43.10   38.70 
 660 nm   43.00   38.70 
 680 nm   42.90   38.70 
 700 nm   42.90   38.40 
Calculated Relative Intensity Colors of Aschamalmite in Air
   0%   30%   60%   90% 100% 120% 150% 180% 210% 230%

Calculated Properties of Aschamalmite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.05 gm/cc
note: Specific Gravity of Aschamalmite =7.35 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.14
Boson Index = 0.86
Help on Photoelectric: Photoelectric: PEAschamalmite =1,610.06 barns/electron
U=PEAschamalmite x rElectron Density=9,735.42 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Aschamalmite is Not Radioactive

Aschamalmite Classification

Help on  Dana Class: Dana Class: (03)Sulfides - Sulfosalts
  (03.01)where z/y > 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.01.11)Dana Group Aschamalmite Pb6Bi2S9 C 2/m 2/m
Help on  Strunz Class: Strunz Class: 02.JB.40b 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.J - Sulfosalts of PbS Archetype
  02.JB -Galena derivatives, with Pb
02.JB.40b Aschamalmite Pb6Bi2S9 C 2/m 2/m
02.JB.40b Eskimoite Ag7Pb10Bi15S36 Am m
02.JB.40b Heyrovskyite Pb10AgBi5S18 C mcm 2/m 2/m 2/m

Other Aschamalmite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(CanMin, v 41, p 431)
Help on See Also: See Also: Links to other databases for Aschamalmite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 02.JB.40b





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