Cuprostibite Mineral Data

Cuprostibite Mineral Data

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General Cuprostibite Information

Chemical Formula:

Cu2(Sb,Tl)

Composition:

Molecular Weight = 265.37 gm

Thallium 15.40 % Tl

Copper 47.89 % Cu

Antimony 36.70 % Sb

______

100.00 %

Empirical Formula:

Cu₂Sb_0.8Tl_0.2

Environment:

In a vein in sodalite syenite and in mineralized dolomite.

IMA Status:

Approved IMA 1969

Locality:

Mt. Nakalak, near Narssaq, Greenland. Langban and Langsjon, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for the composition.

Synonym:

ICSD 42323

PDF 22-601

Cuprostibite Image

Images:

Click Here for Larger Cuprostibite Image

Cuprostibite Ussingite

Comments: Massive ussingite hosting grains of the very rare copper antimony-thallium bearing cuprostibite.
Location: Ilimaussaq, Tasseq, Greenland. Scale: 4.8 x3.4 cm.
© John Veevaert

Cuprostibite Crystallography

Axial Ratios:

a:c = 1:1.52631

Cell Dimensions:

a = 3.99, c = 6.09, Z = 2; V = 96.95 Den(Calc)= 9.09

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/nmm

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

By Intensity(I/I_o): 2.07(1), 2.56(0.5), 2.82(0.4),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
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Help on Above

Pearson W B , Zeitschrift fur Kristallographie , 171 (1985) p.23-39, The Cu2Sb and related structures

Physical Properties of Cuprostibite

Cleavage:

[???] Indistinct

Color:

Steel gray.

Density:

8.42

Diaphaniety:

Opaque

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Hardness:

4 - Fluorite

Luster:

Metallic

Optical Properties of Cuprostibite

RL Anisotrophism:

Strong.

RL Color:

Violet -rose.

RL Pleochroism:

Creamy white to dark rose-violet.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Cuprostibite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	56.00	60.80
420 nm	54.90	59.40
440 nm	53.80	58.00
460 nm	51.10	55.10
480 nm	48.70	52.80
500 nm	46.40	50.50
520 nm	42.90	48.30
540 nm	38.70	45.50
560 nm	36.70	43.90
580 nm	37.90	44.00
600 nm	42.20	45.90
620 nm	47.60	48.60
640 nm	52.90	51.90
660 nm	57.70	54.50
680 nm	61.30	56.90
700 nm	65.00	57.60

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

Calculated Properties of Cuprostibite

Electron Density:

r_electron=7.88 gm/cc
note: r_Cuprostibite=9.09 gm/cc.

Fermion Index

Fermion Index = 0
Boson Index = 1

Photoelectric:

PE_Cuprostibite= 409.08 barns/electron
U=PE_Cuprostibite x r_electron=3,222.96 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Cuprostibite is Not Radioactive

Cuprostibite Classification

Dana Class:

2.4.11.1 (2)Sulfides - Including Selenides and Tellurides

(2.4)where Am Bn Xp, with (m+n):p=2:1

(2.4.11)Dana Group

2.4.11.1 Cuprostibite Cu2(Sb,Tl) P 4/nmm 4/m 2/m 2/m

Strunz Class:

II/A.01-70 II - Sulfides and sulphosalts

II/A - Alloys and alloylike compounds, with Copper, Silver, Gold and Nickel

II/A.01 - Algodonite - Cuprostibite series

II/A.01-10 Algodonite Cu6As P 6₃/mmc 6/m 2/m 2/m

II/A.01-20 Domeykite Cu3As I 43d 4 3m

II/A.01-30 Horsfordite Cu5Sb Unk Cubic

II/A.01-40 Kutinaite Cu14Ag6As7 P m3m 4/m 3 2/m

II/A.01-50 Koutekite Cu5As2 P 6₃/mmc 6/m 2/m 2/m

II/A.01-60 Novakite (Cu,Ag)21As10 C 2/m ? 2/m

II/A.01-70 Cuprostibite Cu2(Sb,Tl) P 4/nmm 4/m 2/m 2/m

Other Cuprostibite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Cuprostibite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 - Franklin Minerals(Dunn) 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Cuprostibite

Cu2(Sb,Tl)
Dana No: 2.4.11.1 Strunz No: II/A.01-70
Locality:

Notes: