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Potosiite Mineral Data
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General Potosiite Information
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 Chemical Formula: |
Pb6Sn2FeSb2S14 |
| Composition: |
Molecular Weight = 2,228.89 gm |
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Iron 2.51 % Fe |
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Tin 10.65 % Sn |
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Antimony 10.92 % Sb |
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Lead 55.78 % Pb |
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Sulfur 20.14 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Pb6Sn2Fe2+Sb2S14 |
| Environment: |
On layered sulfide ore in a complex xenothermal-type hodrothermal tin deposit associated with subvolcanic granitic intrusives. |
| IMA Status: |
Approved IMA 1981 |
| Locality: |
Andacaba deposit, Potosi, Bolivia. Link to MinDat.org Location Data. |
| Name Origin: |
Named for its locality. |
| Name Pronunciation: |
Potosiite + Pronunciation  |
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Potosiite Image |
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Images:
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Potosiite Franckeite
Comments: Visually indistinguishable metallic potosiite/franckeite crystals to 6 mm..
Location: San Jose mine, Oruro City, Oruro Department, Bolivia.
Scale: Crystal size 6 mm.
© Rob Lavinsky |
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Potosiite Crystallography
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| Axial Ratios: |
a:b:c =0.9961:1:2.9285 |
| Cell Dimensions: |
a = 5.915, b = 5.938, c = 17.39, Z = 1; alpha = 91.63°, beta = 91.02°, gamma = 90.84° V = 610.38 Den(Calc)= 6.06 |
| Crystal System: |
Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P 1 ? |
| X Ray Diffraction: |
By Intensity(I/Io): 2.88(1), 2.94(1), 3.45(0.9),4.32(0.9), 1.92(0.1), 2.07(0.1), 2.16(0.1), 5.76(0.1), |
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Physical Properties of Potosiite
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| Cleavage: |
{001} Perfect, {010} Good |
| Color: |
White. |
| Density: |
6.2 |
| Diaphaneity: |
Opaque |
| Habit: |
Aggregates - Made of numerous individual crystals or clusters. |
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. |
| Habit: |
Pseudo Hexagonal - Crystals show a hexagonal outline. |
| Hardness: |
2.5 - Finger Nail |
| Luster: |
Metallic |
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Optical Properties of Potosiite
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| Optical Data: |
NCalc= 1.64 - from Gladstone-Dale relationship (KC = 0.1053) where Ncalc=Dcalc*KC+1
NCalc= 1.65 - from Gladstone-Dale relationship (KC = 0.1053) where Ncalc=Dmeas*KC+1
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| RL Anisotrophism: |
Moderate, bluish gray to grayish pale yellow. |
| RL Color: |
White. |
| RL Pleochroism: |
Faint, from bluish gray to yellowish gray. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Potosiite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 486 nm |
36.20 |
36.90 |
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| 551 nm |
34.90 |
35.35 |
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| 589 nm |
34.40 |
35.10 |
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| 656 nm |
33.90 |
34.50 |
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Calculated Relative Intensity Colors of Potosiite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
240% |
260% |
| R1 |
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| R2 |
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Calculated Properties of Potosiite
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| Electron Density: |
Bulk Density (Electron Density)=5.13 gm/cc
note: Specific Gravity of Potosiite =6.06 gm/cc.
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| Fermion Index: |
Fermion Index = 0.14
Boson Index = 0.86 |
| Photoelectric: |
PEPotosiite =1,085.46 barns/electron
U=PEPotosiite x rElectron Density=5,571.87 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Potosiite is Not Radioactive |
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Potosiite Classification
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| Dana Class: |
03.01.04.04 (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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(03.01.04)Cylindrite Group |
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03.01.04.01 Cylindrite Pb3Sn4FeSb2S14 P1 1 |
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03.01.04.02 Franckeite (Pb,Sn)6FeSn2Sb2S14 P1 1 |
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03.01.04.03 Incaite Pb4Sn4FeSb2S15 P1 ? 1 |
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03.01.04.04 Potosiite Pb6Sn2FeSb2S14 P 1 ? 1 |
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03.01.04.05 Abramovite! Pb2SnInBiS7 P1 1 |
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03.01.04.06 Coiraite! (Pb,Sn)12.5As3Sn5FeS28 Unk Mono |
| Strunz Class: |
02.HF.25b 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.H - Sulfosalts of SnS Archetype |
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02.HF -With SnS and PbS archetype structure units |
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02.HF.25b Franckeite (Pb,Sn)6FeSn2Sb2S14 P1 1 |
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02.HF.25b Incaite Pb4Sn4FeSb2S15 P1 ? 1 |
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02.HF.25b Potosiite Pb6Sn2FeSb2S14 P 1 ? 1 |
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02.HF.25b Coiraite! (Pb,Sn)12.5As3Sn5FeS28 Unk Mono |
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Other Potosiite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Potosiite :
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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Potosiite
Pb6Sn2FeSb2S14
Dana No: 03.01.04.04 Strunz No: 02.HF.25b
Locality:
Notes:
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