Mineralogy Database

Franckeite Mineral Data

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General Franckeite Information

Help on Chemical  Formula: Chemical Formula: (Pb,Sn)6Fe++Sn2Sb2S14
Help on Composition: Composition: Molecular Weight = 1,995.14 gm
   Iron       2.80 %  Fe
   Tin       13.68 %  Sn
   Antimony  12.20 %  Sb
   Lead      48.81 %  Pb
   Sulfur    22.50 %  S
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: Pb4.7Sn2.3Fe2+Sb2S14
Help on Environment: Environment: Hydrothermal Ag-Sn deposits and limestone contact metamorphic deposit.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1893
Help on Locality: Locality: Found in Bolivia at Poopo in Oruro and at Las Aminas, southeast of Chocaya, in Potosi. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the mining engineers, Carl and Ernest Francke.
Help on Name Pronunciation: Name Pronunciation: Franckeite + Pronunciation Say FRANCKEITE
 

Franckeite Image

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  Franckeite

Comments: Massive franckeite with pockets of small .5 mm crystals.
Location: Animas Mine, Atocha-Quechisla district, Sud Chichas Province, Potosí Department, Bolivia. Scale: 25x20x15 mm.
© John Betts - Fine Minerals

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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

Franckeite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =8.0584:1:2.9725
Help on Cell Dimensions: Cell Dimensions: a = 46.9, b = 5.82, c = 17.3, Z = 8; alpha = 90°, beta = 94.68°, gamma = 90° V = 4,706.43 Den(Calc)= 5.63
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.82(1), 3.44(1), 2.91(1),2.86(1), 2.05(0.75), 3.11(0.5), 4.3(0.5),
Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 0 1 0) ( 1 1 1) ( 1 1 0) ( 1 0 0) ( 0 0 1)

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Physical Properties of Franckeite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Grayish black, Blackish gray.
Help on Density: Density: 5.5 - 5.9, Average = 5.7
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Flexible - Flexible fragments.
Help on Habit: Habit: Massive - Fibrous - Distinctly fibrous fine-grained forms.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Metallic
Help on Streak: Streak: grayish black
 

Optical Properties of Franckeite

Help on RL Anisotrophism: RL Anisotrophism: Weak.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Franckeite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   40.90   42.00 
   
 420 nm   40.20   41.40 
 440 nm   39.50   40.80 
 460 nm   38.80   40.20 
 480 nm   38.20   39.70 
 500 nm   37.60   39.10 
 520 nm   37.00   38.60 
 540 nm   36.40   38.20 
 560 nm   35.80   37.70 
 580 nm   35.30   37.30 
 600 nm   34.80   36.80 
 620 nm   34.40   36.50 
 640 nm   33.90   36.00 
 660 nm   33.50   35.70 
 680 nm   33.10   35.40 
 700 nm   32.80   35.10 
Calculated Relative Intensity Colors of Franckeite in Air
Relative
Intensity
   0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 260%
R1                      
R2                      
 

Calculated Properties of Franckeite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.81 gm/cc
note: Specific Gravity of Franckeite =5.63 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.13
Boson Index = 0.87
Help on Photoelectric: Photoelectric: PEFranckeite = 965.32 barns/electron
U=PEFranckeite x rElectron Density=4,643.85 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Franckeite is Not Radioactive
 

Franckeite Classification

Help on  Dana Class: Dana Class: 03.01.04.02 (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
 
03.01.04.01 Cylindrite Pb3Sn4FeSb2S14 P1 1
 
03.01.04.02 Franckeite (Pb,Sn)6FeSn2Sb2S14 P1 1
 
03.01.04.03 Incaite Pb4Sn4FeSb2S15 P1 ? 1
 
03.01.04.04 Potosiite Pb6Sn2FeSb2S14 P 1 ? 1
 
03.01.04.05 Abramovite! Pb2SnInBiS7 P1 1
 
03.01.04.06 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 Franckeite Information

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Franckeite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Print or Cut-and-Paste your Franckeite Specimen Label here :

Franckeite

(Pb,Sn)6Fe++Sn2Sb2S14
Dana No: 03.01.04.02 Strunz No: 02.HF.25b
Locality:

 

Notes:

 

 
   
 


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