Franckeite Mineral Data (original) (raw)
General Franckeite Information
Chemical Formula:
(Pb,Sn)6Fe++Sn2Sb2S14
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 %
Empirical Formula:
Pb4.7Sn2.3Fe2+Sb2S14
Environment:
Hydrothermal Ag-Sn deposits and limestone contact metamorphic deposit.
IMA Status:
Valid Species (Pre-IMA) 1893
Locality:
Found in Bolivia at Poopo in Oruro and at Las Aminas, southeast of Chocaya, in Potosi. Link to MinDat.org Location Data.
Name Origin:
Named after the mining engineers, Carl and Ernest Francke.
Name Pronunciation:
Franckeite + Pronunciation 
Franckeite Image
Images:
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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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Images:
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Franckeite Potosiite 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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Franckeite Crystallography
Axial Ratios:
a:b:c =8.0584:1:2.9725
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
Crystal System:
Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1
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),
Forms:
Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
- 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) Warning: this large pop-up is very compute intensive and may not work well with some computers. | | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
Physical Properties of Franckeite
Cleavage:
{001} Perfect
Color:
Grayish black, Blackish gray.
Density:
5.5 - 5.9, Average = 5.7
Diaphaneity:
Opaque
Fracture:
Flexible - Flexible fragments.
Habit:
Massive - Fibrous - Distinctly fibrous fine-grained forms.
Habit:
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Habit:
Tabular - Form dimensions are thin in one direction.
Hardness:
2.5 - Finger Nail
Luster:
Metallic
Streak:
grayish black
Optical Properties of Franckeite
RL Anisotrophism:
Weak.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Franckeite in Air
| λ | R1 | R 2 |  |
∑ R1(λ) | ∑ R2(λ) |
|---|---|---|---|---|---|
| 400 nm | 40.90 | 42.00 |  |
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| 420 nm | 40.20 | 41.40 |  |
||
| 440 nm | 39.50 | 40.80 |  |
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| 460 nm | 38.80 | 40.20 |  |
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| 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 |  |
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| 580 nm | 35.30 | 37.30 |  |
||
| 600 nm | 34.80 | 36.80 |  |
||
| 620 nm | 34.40 | 36.50 |  |
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| 640 nm | 33.90 | 36.00 |  |
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| 660 nm | 33.50 | 35.70 |  |
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| 680 nm | 33.10 | 35.40 |  |
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| 700 nm | 32.80 | 35.10 |  |
Calculated Relative Intensity Colors of Franckeite in Air
| RelativeIntensity | 0% | 30% | 60% | 90% | 100% | 120% | 150% | 180% | 210% | 240% | 260% |
|---|---|---|---|---|---|---|---|---|---|---|---|
| R1 | |||||||||||
| R2 |
Calculated Properties of Franckeite
Electron Density:
Bulk Density (Electron Density)=4.81 gm/cc
note: Specific Gravity of Franckeite =5.63 gm/cc.
Fermion Index:
Fermion Index = 0.13
Boson Index = 0.87
Photoelectric:
PEFranckeite = 965.32 barns/electron
U=PEFranckeite x rElectron Density=4,643.85 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Franckeite is Not Radioactive
Franckeite Classification
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
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
References:
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
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: