Nuffieldite Mineral Data

General Nuffieldite Information

Chemical Formula:

Pb2Cu(Pb,Bi)Bi2S7

Composition:

Molecular Weight = 1,328.46 gm

Copper 4.78 % Cu

Bismuth 39.33 % Bi

Lead 38.99 % Pb

Sulfur 16.90 % S

______

100.00 %

Empirical Formula:

Pb_2.5CuBi_2.5S₇

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

IMA1967-003

PDF 19-675

Nuffieldite Crystallography

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.54(1), 3.66(1), 4(0.9),

Physical Properties of Nuffieldite

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

Optical Properties of Nuffieldite

RL Anisotrophism:

Very weak, from bluish gray to grayish red.

RL Color:

Pale creamy white.

Calculated Properties of Nuffieldite

Electron Density:

Bulk Density (Electron Density)=5.84 gm/cc
note: Specific Gravity of Nuffieldite =7.01 gm/cc.

Fermion Index:

Fermion Index = 0.08
Boson Index = 0.92

Photoelectric:

PE_Nuffieldite=1,481.29 barns/electron
U=PE_Nuffieldite x rElectron Density=8,652.83 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nuffieldite is Not Radioactive

Nuffieldite Classification

Dana Class:

03.03.04.01 (03)Sulfides - Sulfosalts

(03.03)where 3 < z/y < 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(03.03.04)Dana Group

03.03.04.01 Nuffieldite Pb2Cu(Pb,Bi)Bi2S7 Pbnm 2/m 2/m 2/m

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

02.J - Sulfosalts of PbS Archetype

02.JB -Galena derivatives, with Pb

02.JB.25g Nuffieldite Pb2Cu(Pb,Bi)Bi2S7 Pbnm 2/m 2/m 2/m

Other Nuffieldite Information

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 :

Nuffieldite

Pb2Cu(Pb,Bi)Bi2S7
Dana No: 03.03.04.01 Strunz No: 02.JB.25g
Locality:

Notes:

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