Hocartite Mineral Data

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:

Chocaya-Animas Mine, Atocha-Quechisla District, Bolivia. Link to MinDat.org Location Data.

Name Origin:

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

Name Pronunciation:

Hocartite + Pronunciation

Synonym:

ICSD 42534

PDF 21-1337

Hocartite Image

Images:

Hocartite Rhodostannite

Comments: B&W image of hocartite (hc) and rhodostannite (r) in sphalerite (s) and pyrite (p). (Mineralogical Journal, v15:222).
Location: Toyoha mine, SW Sapporo City, Hokkaido, Japan. Scale: Scale Bar 50µm.
© Mineralogical Journal

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

Diaphaneity:

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:

Bulk Density (Electron Density)=4.30 gm/cc
note: Specific Gravity of Hocartite =4.77 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Hocartite= 179.80 barns/electron
U=PE_Hocartite x rElectron Density= 774.03 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hocartite is Not Radioactive

Hocartite Classification

Dana Class:

02.09.02.06 (02)Sulfides - Including Selenides and Tellurides

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

(02.09.02)Stannite Group (Tetragonal: I-42m) A2BCS type

02.09.02.01 Stannite Cu2FeSnS4 I 42m 4 2m

02.09.02.02 Cernyite Cu2CdSnS4 I 42m 4 2m

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

02.09.02.04 Kuramite Cu3SnS4 I 42m 4 2m

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

02.09.02.06 Hocartite Ag2FeSnS4 I 42m 4 2m

02.09.02.07 Pirquitasite Ag2ZnSnS4 I 42m 4 2m

02.09.02.08 Velikite Cu2HgSnS4 I 42m 4 2m

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

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

02.09.02.11 Barquillite! Cu2CdGeS4 I 42m 4 2m

Strunz Class:

02.CB.15a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.C - Metal Sulfides, M:S = 1:1 (and similar)

02.CB -With Zn, Fe, Cu, Ag, Au, etc

02.CB.15a Cernyite Cu2CdSnS4 I 42m 4 2m

02.CB.15a Ferrokesterite Cu2(Fe,Zn)SnS4 I 42m 4 2m

02.CB.15a Kesterite Cu2(Zn,Fe)SnS4 I 4 4

02.CB.15a Hocartite Ag2FeSnS4 I 42m 4 2m

02.CB.15a Idaite Cu5FeS6 P 6₃/mmc 6/m 2/m 2/m

02.CB.15a Kuramite Cu3SnS4 I 42m 4 2m

02.CB.15a Pirquitasite Ag2ZnSnS4 I 42m 4 2m

02.CB.15a Stannite Cu2FeSnS4 I 42m 4 2m

02.CB.15a Velikite Cu2HgSnS4 I 42m 4 2m

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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Hocartite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Hocartite

Ag2FeSnS4
Dana No: 02.09.02.06 Strunz No: 02.CB.15a
Locality:

Notes: