Cuprobismutite Mineral Data

Cuprobismutite Mineral Data

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General Cuprobismutite Information

Chemical Formula:

Cu10Bi12S23

Composition:

Molecular Weight = 3,880.74 gm

Copper 16.37 % Cu

Bismuth 64.62 % Bi

Sulfur 19.00 % S

______

100.00 %

Empirical Formula:

Cu₁₀Bi₁₂S₂₃

Environment:

In quartz veins with other sulfides.

IMA Status:

Valid Species (Pre-IMA) 1884

Locality:

In the USA, at the Missouri mine, Hall's Calley, Park Co., and the Silver Cliff, Custer Co., Colorado. Link to MinDat.org Location Data.

Name Origin:

For the composition.

Synonym:

ICSD 38364

PDF 29-536

Cuprobismutite Image

Images:

Click Here for Larger Cuprobismutite Image

Cuprobismutite Kupcikite

Comments: Backscattered electron image of kupc?kite (ku) replacing cuprobismutite (cu); both phases are in turn replaced by bsimuthinite derivative (bd79-92).
Location: Felbertal, Austria. Scale: Scale bar 100 µ-m.
© Canadian Mineralogist

Cuprobismutite Crystallography

Axial Ratios:

a:b:c =4.491:1:3.8778

Cell Dimensions:

a = 17.65, b = 3.93, c = 15.24, Z = 1; beta = 100.5° V = 1,039.41 Den(Calc)= 6.20

Crystal System:

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

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

By Intensity(I/I_o): 3.07(1), 2.73(0.6), 3.25(0.4),

Crystal Structure:

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Topa D , Makovicky E , Balic-Zunic T , The Canadian Mineralogist , 41 (2003) p.1481-1501, Crystal structures and crystal chemistry of members of the cuprobismutite, homologous series of sulfosalts, Locality: Felbertal Austria

Physical Properties of Cuprobismutite

Color:

Blue black, Gray, Dark blue black.

Density:

6.47

Diaphaniety:

Opaque

Luster:

Metallic

Streak:

black

Optical Properties of Cuprobismutite

RL Anisotrophism:

Distinct.

RL Color:

Gray tarnishing bluish.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Cuprobismutite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	31.50	38.70
420 nm	32.50	39.20
440 nm	33.50	39.70
460 nm	34.40	40.10
480 nm	35.20	40.50
500 nm	35.80	40.80
520 nm	36.30	41.10
540 nm	36.80	41.30
560 nm	37.10	41.50
580 nm	37.30	41.80
600 nm	37.40	42.00
620 nm	37.40	42.20
640 nm	37.00	42.30
660 nm	36.50	42.20
680 nm	35.70	42.00
700 nm	34.80	41.50

**Calculated Relative Intensity Colors of Cuprobismutite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%	260%
R₁
R₂

Calculated Properties of Cuprobismutite

Electron Density:

r_electron=5.28 gm/cc
note: r_{Cuprobismutite}=6.20 gm/cc.

Fermion Index

Fermion Index = 0.00142
Boson Index = 0.99858

Photoelectric:

PE_{Cuprobismutite}=1,229.22 barns/electron
U=PE_{Cuprobismutite} x r_electron=6,496.40 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Cuprobismutite is Not Radioactive

Cuprobismutite Classification

Dana Class:

3.8.2.1 (3)Sulfides - Sulfosalts

(3.8)where 1 < z/y <2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.8.2)Cuprobismutite Series

3.8.2.1 Cuprobismutite Cu10Bi12S23 C 2/m 2/m

3.8.2.2 Kupcikite! Cu3.4Fe0.6Bi5S10 C 2/m 2/m

Strunz Class:

II/E.04-30 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x), Sulfosalts with predominant Iron and Copper x = 2.0

II/E.04 - Chalcostibite - Hodrushite series

II/E.04-10 Chalcostibite CuSbS2 Pnam 2/m 2/m 2/m

II/E.04-20 Emplectite CuBiS2 Pnam 2/m 2/m 2/m

II/E.04-25 Kupcikite! Cu3.4Fe0.6Bi5S10 C 2/m 2/m

II/E.04-30 Cuprobismutite Cu10Bi12S23 C 2/m 2/m

II/E.04-40 Hodrushite Cu8Bi12S22 A2/m 2/m

Other Cuprobismutite Information

References:

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

See Also:

Links to other databases for Cuprobismutite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Print or Cut-and-Paste your Cuprobismutite Specimen Label here :

Cuprobismutite

Cu10Bi12S23
Dana No: 3.8.2.1 Strunz No: II/E.04-30
Locality:

Notes: