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Nuffieldite Mineral Data
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General Nuffieldite Information
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 Chemical Formula: |
Pb2Cu(Pb,Bi)Bi2S7 |
| Composition: |
Molecular Weight = 1,328.46 gm |
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Copper 4.78 % Cu |
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Bismuth 39.33 % Bi |
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Lead 38.99 % Pb |
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Sulfur 16.90 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Pb2.5CuBi2.5S7 |
| Environment: |
Found in vugs in a small quartz vein in the Lime Creek stock. |
| IMA Status: |
Approved IMA 1968 |
| Locality: |
Lime Creek stock, Alice Arm, BC, Canada. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Edward W. Nuffield (1914-), Canadian mineralogist. |
| Name Pronunciation: |
Nuffieldite + Pronunciation  |
| Synonym: |
ICSD 84625 |
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IMA1967-003 |
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PDF 19-675 |
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Nuffieldite Crystallography
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| Axial Ratios: |
a:b:c =0.6833:1:0.1884 |
| Cell Dimensions: |
a = 14.61, b = 21.38, c = 4.03, Z = 4; V = 1,258.82 Den(Calc)= 7.01 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbnm |
| X Ray Diffraction: |
By Intensity(I/Io): 3.54(1), 3.66(1), 4(0.9), |
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Physical Properties of Nuffieldite
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| Cleavage: |
{001} Perfect |
| Color: |
Gray, Steel gray, Grayish green, Reddish brown. |
| Density: |
7.01 |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Uneven - Very brittle fracture producing uneven fragments. |
| Habit: |
Acicular - Occurs as needle-like crystals. |
| Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
| Hardness: |
3.5-4 - Copper Penny-Fluorite |
| Luster: |
Metallic |
| Streak: |
grayish black |
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Optical Properties of Nuffieldite
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| RL Anisotrophism: |
Very weak, from bluish gray to grayish red. |
| RL Color: |
Pale creamy white. |
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Calculated Properties of Nuffieldite
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| Electron Density: |
Bulk Density (Electron Density)=5.84 gm/cc
note: Specific Gravity of Nuffieldite =7.01 gm/cc.
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| Fermion Index: |
Fermion Index = 0.08
Boson Index = 0.92 |
| Photoelectric: |
PENuffieldite =1,481.29 barns/electron
U=PENuffieldite x rElectron Density=8,652.83 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nuffieldite is Not Radioactive |
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Nuffieldite Classification
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| Dana Class: |
03.03.04.01 (03)Sulfides - Sulfosalts |
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(03.03)where 3 < z/y < 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.03.04)Dana Group |
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03.03.04.01 Nuffieldite Pb2Cu(Pb,Bi)Bi2S7 Pbnm 2/m 2/m 2/m |
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03.03.04.02 Tsugaruite! Pb4As2S7 Pba2 or Pbam Ortho |
| Strunz Class: |
02.JB.25g 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.J - Sulfosalts of PbS Archetype |
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02.JB -Galena derivatives, with Pb |
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02.JB.25g Nuffieldite Pb2Cu(Pb,Bi)Bi2S7 Pbnm 2/m 2/m 2/m |
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Other Nuffieldite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Nuffieldite :
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
15 - WWW-MINCRYST
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Print or Cut-and-Paste your Nuffieldite Specimen Label here :
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Nuffieldite
Pb2Cu(Pb,Bi)Bi2S7
Dana No: 03.03.04.01 Strunz No: 02.JB.25g
Locality:
Notes:
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