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Furutobeite Mineral Data
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General Furutobeite Information
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 Chemical Formula: |
(Cu,Ag)6PbS4 |
| Composition: |
Molecular Weight = 761.06 gm |
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Copper 41.75 % Cu |
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Silver 14.17 % Ag |
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Lead 27.23 % Pb |
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Sulfur 16.85 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Cu5AgPbS4 |
| Environment: |
In veinlets of stromeyerite that cut bornite in the Kuroko zone of a stratbound, Kuroko-type, massive sufide deposit. |
| IMA Status: |
Approved IMA 1978 |
| Locality: |
Furutobe mine, Akita Prefecture, Japan. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Furutobeite + Pronunciation  |
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Furutobeite Image |
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Images:
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Furutobeite
Comments: Black, prismatic furutobeite crystals.
Location: Tsumeb, Namibia.
Scale: See Image.
© William Pinch |
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Furutobeite Crystallography
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| Axial Ratios: |
a:b:c =5.0529:1:2.4489 |
| Cell Dimensions: |
a = 20.025, b = 3.963, c = 9.705, Z = 4; beta = 101.57° V = 754.53 Den(Calc)= 6.70 |
| Crystal System: |
Monoclinic - Domatic H-M Symbol (m) Space Group: Cm ? |
| X Ray Diffraction: |
By Intensity(I/Io): 2.5(1), 2.95(0.9), 2.55(0.7), |
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Physical Properties of Furutobeite
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| Color: |
Gray. |
| Density: |
6.74 |
| Diaphaneity: |
Opaque |
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. |
| Hardness: |
3 - Calcite |
| Luster: |
Metallic |
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Optical Properties of Furutobeite
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| RL Anisotrophism: |
Moderate, from light yellow to dark brown. |
| RL Color: |
Creamy yellow tint. |
| RL Pleochroism: |
Weak. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Furutobeite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
35.70 |
34.20 |
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| 420 nm |
35.20 |
34.30 |
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| 440 nm |
35.00 |
34.50 |
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| 460 nm |
34.70 |
34.90 |
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| 480 nm |
34.50 |
35.30 |
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| 500 nm |
34.40 |
35.60 |
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| 520 nm |
34.40 |
35.90 |
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| 540 nm |
34.60 |
36.20 |
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| 560 nm |
34.70 |
36.30 |
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| 580 nm |
34.80 |
36.40 |
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| 600 nm |
34.90 |
36.40 |
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| 620 nm |
34.90 |
36.30 |
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| 640 nm |
34.90 |
36.30 |
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| 660 nm |
34.80 |
36.20 |
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| 680 nm |
34.50 |
36.10 |
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| 700 nm |
34.30 |
36.00 |
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Calculated Relative Intensity Colors of Furutobeite 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 Furutobeite
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| Electron Density: |
Bulk Density (Electron Density)=5.95 gm/cc
note: Specific Gravity of Furutobeite =6.70 gm/cc.
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| Fermion Index: |
Fermion Index = 0.06
Boson Index = 0.94 |
| Photoelectric: |
PEFurutobeite = 527.62 barns/electron
U=PEFurutobeite x rElectron Density=3,139.95 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Furutobeite is Not Radioactive |
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Furutobeite Classification
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| Dana Class: |
02.16.12.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.16)with miscellaneous formulae |
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(02.16.12)Dana Group |
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02.16.12.01 Furutobeite (Cu,Ag)6PbS4 Cm ? m |
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02.16.12.02 Schlemaite! (Cu,[])6(Pb,Bi)Se4 P 21/m 2/m |
| Strunz Class: |
02.BE.10 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1) |
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02.BE -With Pb(Bi) |
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02.BE.10 Furutobeite (Cu,Ag)6PbS4 Cm ? m |
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Other Furutobeite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Furutobeite :
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 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
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Print or Cut-and-Paste your Furutobeite Specimen Label here :
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Furutobeite
(Cu,Ag)6PbS4
Dana No: 02.16.12.01 Strunz No: 02.BE.10
Locality:
Notes:
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