Mineralogy Database

Potosiite Mineral Data

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General Potosiite Information

Help on Chemical  Formula: Chemical Formula: Pb6Sn2FeSb2S14
Help on Composition: Composition: Molecular Weight = 2,228.89 gm
   Iron       2.51 %  Fe
   Tin       10.65 %  Sn
   Antimony  10.92 %  Sb
   Lead      55.78 %  Pb
   Sulfur    20.14 %  S
            100.00 % 
Help on Empirical Formula: Empirical Formula: Pb6Sn2Fe2+Sb2S14
Help on Environment: Environment: On layered sulfide ore in a complex xenothermal-type hodrothermal tin deposit associated with subvolcanic granitic intrusives.
Help on IMA Status: IMA Status: Approved IMA 1981
Help on Locality: Locality: Andacaba deposit, Potosi, Bolivia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its locality.
Help on Name Pronunciation: Name Pronunciation: Potosiite + Pronunciation Say POTOSIITE

Potosiite Image

Click Here for Larger   Image in a New Browser Window 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

Potosiite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9961:1:2.9285
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P 1 ?
Help on X Ray Diffraction: 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),

Physical Properties of Potosiite

Help on Cleavage: Cleavage: {001} Perfect, {010} Good
Help on Color: Color: White.
Help on Density: Density: 6.2
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Habit: Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Metallic

Optical Properties of Potosiite

Help on Optical Data: 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
Help on RL Anisotrophism: RL Anisotrophism: Moderate, bluish gray to grayish pale yellow.
Help on RL Color: RL Color: White.
Help on RL Pleochroism: RL Pleochroism: Faint, from bluish gray to yellowish gray.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Potosiite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 486 nm   36.20   36.90 
 551 nm   34.90   35.35 
 589 nm   34.40   35.10 
 656 nm   33.90   34.50 
Calculated Relative Intensity Colors of Potosiite in Air
   0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 260%

Calculated Properties of Potosiite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.13 gm/cc
note: Specific Gravity of Potosiite =6.06 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.14
Boson Index = 0.86
Help on Photoelectric: Photoelectric: PEPotosiite =1,085.46 barns/electron
U=PEPotosiite x rElectron Density=5,571.87 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Potosiite is Not Radioactive

Potosiite 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
  (03.01.04)Cylindrite Group Cylindrite Pb3Sn4FeSb2S14 P1 1 Franckeite (Pb,Sn)6FeSn2Sb2S14 P1 1 Incaite Pb4Sn4FeSb2S15 P1 ? 1 Potosiite Pb6Sn2FeSb2S14 P 1 ? 1 Abramovite! Pb2SnInBiS7 P1 1 Coiraite! (Pb,Sn)12.5As3Sn5FeS28 Unk Mono
Help on  Strunz Class: Strunz Class: 02.HF.25b 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.H - Sulfosalts of SnS Archetype
  02.HF -With SnS and PbS archetype structure units
02.HF.25b Franckeite (Pb,Sn)6FeSn2Sb2S14 P1 1
02.HF.25b Incaite Pb4Sn4FeSb2S15 P1 ? 1
02.HF.25b Potosiite Pb6Sn2FeSb2S14 P 1 ? 1
02.HF.25b Coiraite! (Pb,Sn)12.5As3Sn5FeS28 Unk Mono

Other Potosiite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: 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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Dana No: Strunz No: 02.HF.25b





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