Famatinite Mineral Data

Famatinite Mineral Data +

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General Famatinite Information

Chemical Formula:

Cu3SbS4

Composition:

Molecular Weight = 440.65 gm

Copper 43.26 % Cu

Antimony 27.63 % Sb

Sulfur 29.11 % S

______

100.00 %

Empirical Formula:

Cu₃SbS₄

Environment:

Antimony (Sb) analog of enargite (arsenic-As).

IMA Status:

Valid Species (Pre-IMA) 1873

Locality:

Sierra de Famatina, La Rioja, Argentina. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Synonym:

ICSD 2857

PDF 35-581

Famatinite Image

Images:

Famatinite Enargite

Comments: Violet metallic crystalline famatinite with black massive enargite.
Location: Cerro de Pasco, Pasco, Peru. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Famatinite

Comments: Dark, purplish black, massive famatinite.
Location: Tertiary volcanic massif, the Serrania de Laurani, Bolivia. Scale: Picture size 2 cm.
© Dave Barthelmy

Famatinite Crystallography

Axial Ratios:

a:c = 1:1.99585

Cell Dimensions:

a = 5.3853, c = 10.7483, Z = 2; V = 311.72 Den(Calc)= 4.69

Crystal System:

Tetragonal - ScalenohedralH-M Symbol (4 2m) Space Group: I 42m

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

By Intensity(I/I_o): 3.108(1), 1.902(0.65), 1.6233(0.35),

Physical Properties of Famatinite

Cleavage:

[101] Good, [100] Distinct

Color:

Grayish black, Dark pink brown, Steel gray.

Density:

4.57

Diaphaniety:

Opaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Hardness:

3-4 - Calcite-Fluorite

Luminescence:

Non-fluorescent.

Luster:

Metallic

Magnetism:

Nonmagnetic

Streak:

black

Optical Properties of Famatinite

RL Anisotrophism:

Strong, greenish yellow and purplish red.

RL Color:

Pale brownish pink.

RL Pleochroism:

Weak, light orange, pink-violet.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Famatinite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	24.40	30.00
420 nm	24.20	25.50
440 nm	24.00	25.00
460 nm	23.80	24.10
480 nm	23.10	23.40
500 nm	22.70	23.10
520 nm	22.90	23.60
540 nm	23.80	25.00
560 nm	24.30	26.00
580 nm	24.50	26.50
600 nm	24.80	27.00
620 nm	25.40	27.50
640 nm	26.00	28.10
660 nm	26.80	28.60
680 nm	27.30	29.00
700 nm	27.50	29.40

**Calculated Relative Intensity Colors of Famatinite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%	360%	370%
R₁
R₂

Calculated Properties of Famatinite

Electron Density:

r_electron=4.30 gm/cc
note: r_Famatinite=4.69 gm/cc.

Fermion Index

Fermion Index = 0.00218
Boson Index = 0.99782

Photoelectric:

PE_Famatinite= 110.11 barns/electron
U=PE_Famatinite x r_electron= 473.47 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Famatinite is Not Radioactive

Famatinite Classification

Dana Class:

3.2.2.2 (3)Sulfides - Sulfosalts

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

(3.2.2)Dana Group

3.2.2.1 Luzonite Cu3AsS4 I 42m 4 2m

3.2.2.2 Famatinite Cu3SbS4 I 42m 4 2m

3.2.2.3 Permingeatite Cu3SbSe4 I 42m 4 2m

Strunz Class:

II/C.06-20 II - Sulfides and sulphosalts

II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1

II/C.06 - Stannite group

II/C.06-10 Luzonite Cu3AsS4 I 42m 4 2m

II/C.06-20 Famatinite Cu3SbS4 I 42m 4 2m

II/C.06-30 Permingeatite Cu3SbSe4 I 42m 4 2m

II/C.06-40 Briartite Cu2(Zn,Fe)GeS4 I 42m 4 2m

II/C.06-45 Barquillite! Cu2CdGeS4 I 42m 4 2m

II/C.06-50 Kuramite Cu3SnS4 I 42m 4 2m

II/C.06-60 Stannite Cu2FeSnS4 I 42m 4 2m

II/C.06-70 Ferrokesterite Cu2(Fe,Zn)SnS4 I 42m 4 2m

II/C.06-80 Kesterite Cu2(Zn,Fe)SnS4 I 4 4

II/C.06-90 Cernyite Cu2CdSnS4 I 42m 4 2m

II/C.06-100 Velikite Cu2HgSnS4 I 42m 4 2m

II/C.06-110 Hocartite Ag2FeSnS4 I 42m 4 2m

II/C.06-120 Pirquitasite Ag2ZnSnS4 I 42m 4 2m

II/C.06-130 Sakuraiite (Cu,Zn,Fe,In,Sn)4S4 P 4₃2, P 43m, or P m3m Cubic

II/C.06-140 Petrukite (Cu,Fe,Zn)2(Sn,In)S4 P mn2₁ mm2

II/C.06-150 Rhodostannite Cu2FeSn3S8 I 4₁/a 4/m

II/C.06-160 Toyohaite Ag2FeSn3S8 I 4₁/a 4/m

Other Famatinite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

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Famatinite

Cu3SbS4
Dana No: 3.2.2.2 Strunz No: II/C.06-20
Locality:

Notes: