Nordstromite Mineral Data

Nordstromite Mineral Data +

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General Nordstromite Information

Chemical Formula:

Pb3CuBi7(S10Se4)

Composition:

Molecular Weight = 2,784.51 gm

Copper 2.28 % Cu

Bismuth 52.54 % Bi

Lead 22.32 % Pb

Selenium 11.34 % Se

Sulfur 11.52 % S

______

100.00 %

Empirical Formula:

Pb₃CuBi₇S₁₀Se₄

Environment:

Of hydrothermal origin.

IMA Status:

Approved IMA 1980

Locality:

Falun (Fahlun), Kopparberg, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for T. Nordstrom.

Synonym:

Nordstroemite

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Nordstromite Crystallography

Axial Ratios:

a:b:c =4.3722:1:4.2871

Cell Dimensions:

a = 17.97, b = 4.11, c = 17.62, Z = 2; beta = 94.3° V = 1,297.69 Den(Calc)= 7.13

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

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

By Intensity(I/I_o): 3.066(1), 2.242(0.7), 3.583(0.5),

Crystal Structure:

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Mumme W G , The Canadian Mineralogist , 18 (1980) p.343-352, The crystal structure of nordstromite CuPb3Bi7(S,Se)14, from Falun,, Sweden: A member of the junoite homologous series, Locality: Falun, Sweden

Physical Properties of Nordstromite

Color:

Gray.

Diaphaniety:

Opaque

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

2-2.5 - Gypsum-Finger Nail

Luster:

Metallic

Optical Properties of Nordstromite

Optical Data:

NCalc= 1.91 - from Gladstone-Dale relationship (KC = 0.1276) where Ncalc=Dcalc*KC+1

RL Anisotrophism:

Dark gray to brown.

RL Color:

White with a gray tint.

Calculated Properties of Nordstromite

Electron Density:

r_electron=5.90 gm/cc
note: r_Nordstromite=7.13 gm/cc.

Fermion Index

Fermion Index = 0.05881
Boson Index = 0.94119

Photoelectric:

PE_Nordstromite=1,447.43 barns/electron
U=PE_Nordstromite x r_electron=8,539.26 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Nordstromite is Not Radioactive

Nordstromite Classification

Dana Class:

3.7.13.1 (3)Sulfides - Sulfosalts

(3.7)where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.7.13)Dana Group

3.7.13.1 Nordstromite Pb3CuBi7(S10Se4) P 2₁/m 2/m

Strunz Class:

II/E.34-70 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.34 - Cosalite - Galenobismuthite

II/E.34-08 Mozgovaite! PbBi4(S,Se)7 Bbmm 2/m 2/m 2/m

II/E.34-10 Cosalite Pb2Bi2S5 Pbnm 2/m 2/m 2/m

II/E.34-20 Proudite (Pb,Cu)8Bi9-10(S,Se)22 C 2/m 2/m

II/E.34-30 Weibullite Pb6Bi8(S,Se)18 P nma 2/m 2/m 2/m

II/E.34-60 Cannizzarite Pb4Bi6S13 C 2/m 2/m

II/E.34-65 Wittite Pb3Bi4(S,Se)9 P 2/m 2/m

II/E.34-70 Nordstromite Pb3CuBi7(S10Se4) P 2₁/m 2/m

II/E.34-80 Junoite Pb3Cu2Bi8(S,Se)16 C 2/m 2/m

II/E.34-85 Felbertalite! Cu2Pb6Bi8S19 C 2/m 2/m

II/E.34-90 Watkinsonite PbCu2Bi4(Se,S)8 Pm ? m

II/E.34-100 Paderaite AgPb2Cu6Bi11S22 P 2₁/m 2/m

II/E.34-110 Galenobismutite PbBi2S4 Pnam 2/m 2/m 2/m

Other Nordstromite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Nordstromite :
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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Nordstromite

Pb3CuBi7(S10Se4)
Dana No: 3.7.13.1 Strunz No: II/E.34-70
Locality:

Notes: