Nuffieldite Mineral Data

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.

Synonym:

ICSD 84625

IMA1967-003

PDF 19-675

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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 - DipyramidalH-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),

Crystal Structure:

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Moelo Y , Meerschaut A , Makovicky E , The Canadian Mineralogist , 35 (1997) p.1497-1508, Refinement of the crystal structure of nuffieldite, Pb2Cu1.4(Pb.4Bi.4Sb.2)Bi2S7:, Structural relationships and genesis of complex lead sulfosalt structures

Physical Properties of Nuffieldite

Cleavage:

[001] Perfect

Color:

Gray, Steel gray, Grayish green, Reddish brown.

Density:

7.01

Diaphaniety:

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:

r_electron=5.84 gm/cc
note: r_Nuffieldite=7.01 gm/cc.

Fermion Index

Fermion Index = 0.08744
Boson Index = 0.91256

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Nuffieldite is Not Radioactive

Nuffieldite Classification

Dana Class:

3.3.4.1 (3)Sulfides - Sulfosalts

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

(3.3.4)Dana Group

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

3.3.4.2 Tsugaruite! Pb4As2S7 Pba2 or Pbam Ortho

Strunz Class:

II/E.33-40 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x) Lead-Sulfosalts (Pb-Cu/Ag) with predominant Vismut x = 6.0 - 1.6

II/E.33 - Izoklakeite - Berryite series

II/E.33-05 Izoklakeite Pb27(Cu,Fe)2(Sb,Bi)19S57 Pnnm 2/m 2/m 2/m

II/E.33-10 Giessenite Pb13(Cu,Ag)(Bi,Sb)9S28(?) P 2₁/n 2/m

II/E.33-15 Tintinaite Pb22Cu4(Sb,Bi)30S69 Pnnm 2/m 2/m 2/m

II/E.33-20 Kobellite Pb22Cu4(Bi,Sb)30S69 Pnmm 2/m 2/m 2/m

II/E.33-30 Eclarite Pb9(Cu,Fe)Bi12S28 P nma 2/m 2/m 2/m

II/E.33-40 Nuffieldite Pb2Cu(Pb,Bi)Bi2S7 Pbnm 2/m 2/m 2/m

II/E.33-50 Berryite Pb3(Ag,Cu)5Bi7S16 P 2₁/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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Nuffieldite

Pb2Cu(Pb,Bi)Bi2S7
Dana No: 3.3.4.1 Strunz No: II/E.33-40
Locality:

Notes: