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Aschamalmite Mineral Data
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General Aschamalmite Information
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 Chemical Formula: |
Pb6Bi2S9 |
| Composition: |
Molecular Weight = 1,949.75 gm |
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Bismuth 21.44 % Bi |
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Lead 63.76 % Pb |
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Sulfur 14.80 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Pb6Bi2S9 |
| Environment: |
In alpine cleft veins, cutting gneiss. |
| IMA Status: |
Approved IMA 1983 |
| Locality: |
Ascham Alm, Untersulzbachtal, Austria. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Aschamalmite + Pronunciation  |
| Synonym: |
Beegerite |
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Aschamalmite Image |
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Images:
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Aschamalmite
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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Images:
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Aschamalmite
Comments: Lead gray metallic prismatic aschamalmite crystals in veins in quartz.
Location: Ascham Alp, Untersulzbach Valley, Salzburg, Austria.
Scale: See Image.
© Rruff Database |
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Aschamalmite Crystallography
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| Axial Ratios: |
a:b:c =3.352:1:7.6845 |
| Cell Dimensions: |
a = 13.71, b = 4.09, c = 31.43, Z = 4; beta = 91° V = 1,762.13 Den(Calc)= 7.35 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m |
| X Ray Diffraction: |
By Intensity(I/Io): 3.426(1), 3.378(0.88), 2.941(0.54), |
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Physical Properties of Aschamalmite
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| Cleavage: |
{001} Perfect |
| Color: |
Lead gray, Gray. |
| Density: |
7.27 |
| Diaphaneity: |
Opaque |
| Habit: |
Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape. |
| Habit: |
Massive - Uniformly indistinguishable crystals forming large masses. |
| Hardness: |
3.5 - Copper Penny |
| Luminescence: |
Non-fluorescent. |
| Luster: |
Metallic |
| Magnetism: |
Nonmagnetic |
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Optical Properties of Aschamalmite
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| RL Anisotrophism: |
Moderate, from gray to red-brown. |
| RL Color: |
Creamy white. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Aschamalmite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
48.80 |
44.10 |
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| 420 nm |
48.20 |
43.50 |
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| 440 nm |
47.50 |
43.00 |
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| 460 nm |
46.70 |
42.50 |
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| 480 nm |
46.40 |
42.10 |
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| 500 nm |
45.80 |
41.70 |
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| 520 nm |
44.80 |
41.10 |
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| 540 nm |
44.30 |
40.50 |
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| 546 nm |
44.00 |
40.10 |
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| 560 nm |
43.90 |
40.00 |
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| 580 nm |
43.80 |
39.70 |
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| 589 nm |
43.50 |
39.40 |
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| 600 nm |
43.50 |
39.30 |
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| 620 nm |
43.30 |
39.00 |
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| 640 nm |
43.20 |
38.80 |
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| 650 nm |
43.10 |
38.70 |
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| 660 nm |
43.00 |
38.70 |
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| 680 nm |
42.90 |
38.70 |
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| 700 nm |
42.90 |
38.40 |
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Calculated Relative Intensity Colors of Aschamalmite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
230% |
| R1 |
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| R2 |
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Calculated Properties of Aschamalmite
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| Electron Density: |
Bulk Density (Electron Density)=6.05 gm/cc
note: Specific Gravity of Aschamalmite =7.35 gm/cc.
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| Fermion Index: |
Fermion Index = 0.14
Boson Index = 0.86 |
| Photoelectric: |
PEAschamalmite =1,610.06 barns/electron
U=PEAschamalmite x rElectron Density=9,735.42 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Aschamalmite is Not Radioactive |
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Aschamalmite Classification
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| Dana Class: |
03.01.11.01 (03)Sulfides - Sulfosalts |
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(03.01)where z/y > 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.01.11)Dana Group |
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03.01.11.01 Aschamalmite Pb6Bi2S9 C 2/m 2/m |
| Strunz Class: |
02.JB.40b 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.J - Sulfosalts of PbS Archetype |
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02.JB -Galena derivatives, with Pb |
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02.JB.40b Aschamalmite Pb6Bi2S9 C 2/m 2/m |
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02.JB.40b Eskimoite Ag7Pb10Bi15S36 Am m |
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02.JB.40b Heyrovskyite Pb10AgBi5S18 C mcm 2/m 2/m 2/m |
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Other Aschamalmite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(CanMin, v 41, p 431) |
| 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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Aschamalmite
Pb6Bi2S9
Dana No: 03.01.11.01 Strunz No: 02.JB.40b
Locality:
Notes:
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