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Schirmerite Mineral Data
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General Schirmerite Information
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 Chemical Formula: |
Ag3Pb3Bi9S18 to Ag3Pb6Bi7S18 |
| Composition: |
Molecular Weight = 2,985.26 gm |
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Silver 10.84 % Ag |
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Bismuth 49.00 % Bi |
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Lead 20.82 % Pb |
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Sulfur 19.33 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Ag3Pb3Bi7S18 |
| Environment: |
Disseminated through quartz. |
| IMA Status: |
Valid Species (Pre-IMA) 1874 |
| Locality: |
Treasury lode, Geneva district, Park Co., Colorado, USA. Link to MinDat.org Location Data. |
| Name Origin: |
Named for J. H. L. Schirmer, superintendent of the U. S. Mint, Denver, Colorado, USA. |
| Name Pronunciation: |
Schirmerite + Pronunciation  |
| Synonym: |
Beegerite - mixture of schirmerite and matildite |
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Schirmerite Image |
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Images:
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Schirmerite Crystallography
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| Axial Ratios: |
a:b:c =0.3029:1:0.0905 |
| Cell Dimensions: |
a = 13.45, b = 44.4, c = 4.02, Z = 4; V = 2,400.66 Den(Calc)= 8.26 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Bbmm |
| X Ray Diffraction: |
By Intensity(I/Io): 2.82(1), 3.27(0.7), 1.961(0.6), |
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Physical Properties of Schirmerite
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| Cleavage: |
None |
| Color: |
Lead gray, Gray, Iron black. |
| Density: |
6.74 |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Uneven - Very brittle fracture producing uneven fragments. |
| Habit: |
Massive - Granular - Common texture observed in granite and other igneous rock. |
| Hardness: |
2 - Gypsum |
| Luminescence: |
Non-fluorescent. |
| Luster: |
Metallic |
| Magnetism: |
Nonmagnetic |
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Optical Properties of Schirmerite
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| RL Anisotrophism: |
Weak in air, distinct to strong in oil, in gray to black. |
| RL Color: |
White. |
| RL Pleochroism: |
Weak in air, weak to distinct in oil. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Schirmerite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
42.60 |
46.60 |
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| 420 nm |
43.00 |
47.30 |
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| 440 nm |
43.40 |
48.00 |
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| 460 nm |
43.60 |
48.20 |
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| 480 nm |
43.50 |
48.20 |
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| 500 nm |
43.20 |
48.00 |
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| 520 nm |
42.90 |
47.70 |
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| 540 nm |
42.40 |
47.20 |
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| 560 nm |
42.00 |
46.70 |
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| 580 nm |
41.70 |
46.20 |
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| 600 nm |
41.40 |
46.00 |
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| 620 nm |
41.20 |
45.70 |
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| 640 nm |
41.10 |
45.60 |
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| 660 nm |
41.00 |
45.50 |
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| 680 nm |
40.90 |
45.30 |
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| 700 nm |
40.90 |
45.10 |
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Calculated Relative Intensity Colors of Schirmerite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
220% |
| R1 |
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| R2 |
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Calculated Properties of Schirmerite
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| Electron Density: |
Bulk Density (Electron Density)=6.95 gm/cc
note: Specific Gravity of Schirmerite =8.26 gm/cc.
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| Fermion Index: |
Fermion Index = 0.04
Boson Index = 0.96 |
| Photoelectric: |
PESchirmerite =1,347.60 barns/electron
U=PESchirmerite x rElectron Density=9,366.52 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Schirmerite is Not Radioactive |
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Schirmerite Classification
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| Dana Class: |
03.05.05.01 (03)Sulfides - Sulfosalts |
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(03.05)where 2.5 < z/y < 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.05.05)Dana Group |
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03.05.05.01 Schirmerite Ag3Pb3Bi9S18toAg3Pb6Bi7S18 Bbmm 2/m 2/m 2/m |
| Strunz Class: |
02.JB.40d 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.40d Schirmerite Ag3Pb3Bi9S18toAg3Pb6Bi7S18 Bbmm 2/m 2/m 2/m |
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Other Schirmerite Information
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| References: |
NAME( Ford32) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Schirmerite :
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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Print or Cut-and-Paste your Schirmerite Specimen Label here :
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Schirmerite
Ag3Pb3Bi9S18 to Ag3Pb6Bi7S18
Dana No: 03.05.05.01 Strunz No: 02.JB.40d
Locality:
Notes:
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