Hocartite Mineral Data

Hocartite Mineral Data +

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General Hocartite Information

Chemical Formula:

Ag2FeSnS4

Composition:

Molecular Weight = 518.56 gm

Iron 10.77 % Fe

Silver 41.60 % Ag

Tin 22.89 % Sn

Sulfur 24.73 % S

______

100.00 %

Empirical Formula:

Ag₂Fe²⁺SnS₄

Environment:

In tin veins.

IMA Status:

Approved IMA 1968

Locality:

In Bolivia, from Tacama, Hocaya, Colquechaca, Potosi, and Chocaya. Link to MinDat.org Location Data.

Name Origin:

For Raymind Hocart, Professor of Mineralogy, University of Paris, France.

Synonym:

ICSD 42534

PDF 21-1337

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Hocartite Crystallography

Axial Ratios:

a:c = 1:1.9094

Cell Dimensions:

a = 5.74, c = 10.96, Z = 2; V = 361.11 Den(Calc)= 4.77

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): 3.26(1), 1.98(0.8), 1.72(0.7),

Physical Properties of Hocartite

Color:

Brownish gray.

Density:

4.77

Diaphaniety:

Opaque

Hardness:

4 - Fluorite

Luster:

Metallic

Optical Properties of Hocartite

RL Anisotrophism:

Distinct, orange to greenish.

RL Color:

Brownish gray.

RL Pleochroism:

Weak, gray-brown to violet gray.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Hocartite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	27.00	27.70
420 nm	26.50	27.20
440 nm	26.00	26.70
460 nm	25.50	26.30
480 nm	25.20	26.00
500 nm	24.80	25.70
520 nm	24.70	25.50
540 nm	24.50	25.40
560 nm	24.40	25.30
580 nm	24.50	25.40
600 nm	24.60	25.50
620 nm	24.80	25.60
640 nm	25.20	25.20
660 nm	25.40	24.80
680 nm	24.80	24.40
700 nm	23.70	24.50

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

Calculated Properties of Hocartite

Electron Density:

r_electron=4.30 gm/cc
note: r_Hocartite=4.77 gm/cc.

Fermion Index

Fermion Index = 0.04218
Boson Index = 0.95782

Photoelectric:

PE_Hocartite= 179.80 barns/electron
U=PE_Hocartite x r_electron= 774.03 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hocartite is Not Radioactive

Hocartite Classification

Dana Class:

2.9.2.6 (2)Sulfides - Including Selenides and Tellurides

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

(2.9.2)Stannite Group (Tetragonal: I4¯2m) A2BCS type

2.9.2.1 Stannite Cu2FeSnS4 I 42m 4 2m

2.9.2.2 Cernyite Cu2CdSnS4 I 42m 4 2m

2.9.2.3 Briartite Cu2(Zn,Fe)GeS4 I 42m 4 2m

2.9.2.4 Kuramite Cu3SnS4 I 42m 4 2m

2.9.2.5 Sakuraiite (Cu,Zn,Fe,In,Sn)4S4 P 4₃2, P 43m, or P m3m Cubic

2.9.2.6 Hocartite Ag2FeSnS4 I 42m 4 2m

2.9.2.7 Pirquitasite Ag2ZnSnS4 I 42m 4 2m

2.9.2.8 Velikite Cu2HgSnS4 I 42m 4 2m

2.9.2.9 Kesterite Cu2(Zn,Fe)SnS4 I 4 4

2.9.2.10 Ferrokesterite Cu2(Fe,Zn)SnS4 I 42m 4 2m

2.9.2.11 Barquillite! Cu2CdGeS4 I 42m 4 2m

Strunz Class:

II/C.06-110 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 Hocartite Information

References:

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

See Also:

Links to other databases for Hocartite :
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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Hocartite

Ag2FeSnS4
Dana No: 2.9.2.6 Strunz No: II/C.06-110
Locality:

Notes: