Hocartite
A valid IMA mineral species
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About Hocartite
Formula:
Ag2(Fe2+,Zn)SnS4
Colour:
Brownish-grey
Lustre:
Metallic
Hardness:
4
Specific Gravity:
4.77 (Calculated)
Crystal System:
Tetragonal
Member of:
Name:
Named in honor of Raymond Hocart (21 May 1896, Kabylie, Algeria - 5 December 1983), Professor of Mineralogy, University of Paris, France.
Information from https://www.monumentsmenandwomenfnd.org/hocart-lt-col-raymond :
"Hocart served with the French Army during World War II. In September 1945 he was assigned to the headquarters of U.S. Seventh Army as a Restitution Officer for the MFAA. He was charged with locating, identifying, and returning to France scientific materials, archives, and research documents stolen from the University of Strasbourg by the Nazis. Upon the liberation of Alsace by French troops in November 1944, it was estimated that, of the tens of thousands of books belonging to the university, only 600 remained. Hocart traveled throughout the U.S. Zone of Occupation conducting investigations at countless repositories for looted art. He tracked cases of books and archives to Schloss Neuenstein, multiple officers’ clubs, and the Heilbronn and Kochendorf mines. In October 1945 he visited a factory near Bopfingen, Germany, where he discovered 100 cases of scientific instruments along with five cupboards, three tables, and even a stove belonging to the university’s laboratory.
Following his involvement with the MFAA, Hocart returned to France and became Professor of Mineralogy at the University of Paris. He became well-known for his continuing studies of crystals and minerals. His numerous articles and books on the subject include Les Cristaux (1968) and Les Minéraux, Qu’est-ce Que C’est? (1978). In January 1968, The Commission on New Minerals and Mineral Names of the International Mineralogical Association (IMA) voted to honor Hocart by naming a new mineral after him."
Information from https://www.monumentsmenandwomenfnd.org/hocart-lt-col-raymond :
"Hocart served with the French Army during World War II. In September 1945 he was assigned to the headquarters of U.S. Seventh Army as a Restitution Officer for the MFAA. He was charged with locating, identifying, and returning to France scientific materials, archives, and research documents stolen from the University of Strasbourg by the Nazis. Upon the liberation of Alsace by French troops in November 1944, it was estimated that, of the tens of thousands of books belonging to the university, only 600 remained. Hocart traveled throughout the U.S. Zone of Occupation conducting investigations at countless repositories for looted art. He tracked cases of books and archives to Schloss Neuenstein, multiple officers’ clubs, and the Heilbronn and Kochendorf mines. In October 1945 he visited a factory near Bopfingen, Germany, where he discovered 100 cases of scientific instruments along with five cupboards, three tables, and even a stove belonging to the university’s laboratory.
Following his involvement with the MFAA, Hocart returned to France and became Professor of Mineralogy at the University of Paris. He became well-known for his continuing studies of crystals and minerals. His numerous articles and books on the subject include Les Cristaux (1968) and Les Minéraux, Qu’est-ce Que C’est? (1978). In January 1968, The Commission on New Minerals and Mineral Names of the International Mineralogical Association (IMA) voted to honor Hocart by naming a new mineral after him."
Unique Identifiers
Mindat ID:
1911
Long-form identifier:
mindat:1:1:1911:4
IMA Classification of Hocartite
Approved
IMA Formula:
Ag1+2Fe2+Sn4+S2-4
Approval year:
1967
First published:
1968
Classification of Hocartite
2.CB.15a
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
C : Metal Sulfides, M: S = 1: 1 (and similar)
B : With Zn, Fe, Cu, Ag, etc.
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
C : Metal Sulfides, M: S = 1: 1 (and similar)
B : With Zn, Fe, Cu, Ag, etc.
2.9.2.6
2 : SULFIDES
9 : AmBnXp, with (m+n):p = 1:1
2 : SULFIDES
9 : AmBnXp, with (m+n):p = 1:1
6.1.16
6 : Sulphosalts - Sulphostannates, Sulphogermanates,Sulpharsenates, Sulphantimonates, Sulphovanadates and Sulphohalides
1 : Sulphostannates and other sulfides containing Sn
6 : Sulphosalts - Sulphostannates, Sulphogermanates,Sulpharsenates, Sulphantimonates, Sulphovanadates and Sulphohalides
1 : Sulphostannates and other sulfides containing Sn
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Hoc | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Hoc | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Hocartite
Metallic
Transparency:
Opaque
Colour:
Brownish-grey
Hardness:
4 on Mohs scale
Hardness:
VHN25=209 - 234 kg/mm2 - Vickers
Hardness Data:
Measured
Density:
4.77 g/cm3 (Calculated)
Optical Data of Hocartite
Type:
Uniaxial (-)
Anisotropism:
distinct orangish to greenish
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 400nm | 27.0% | 27.7% |
| 420nm | 26.5% | 27.2% |
| 440nm | 26.0% | 26.7% |
| 460nm | 25.5% | 26.3% |
| 480nm | 25.2% | 26.0% |
| 500nm | 24.8% | 25.7% |
| 520nm | 24.7% | 25.5% |
| 540nm | 24.5% | 25.4% |
| 560nm | 24.4% | 25.3% |
| 580nm | 24.5% | 25.4% |
| 600nm | 24.6% | 25.5% |
| 620nm | 24.8% | 25.6% |
| 640nm | 25.2% | 25.2% |
| 660nm | 25.4% | 24.8% |
| 680nm | 24.8% | 24.4% |
| 700nm | 23.7% | 24.5% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 27.7%.
R1 shown in black, R2 shown in red
Colour in reflected light:
brownish grey
Pleochroism:
Weak
Comments:
gray brown to violet gray
Chemistry of Hocartite
Mindat Formula:
Ag2(Fe2+,Zn)SnS4
Element Weights:
Common Impurities:
Zn,Cu
Crystallography of Hocartite
Crystal System:
Tetragonal
Class (H-M):
42m - Scalenohedral
Space Group:
I42m
Cell Parameters:
a = 5.74(3) Å, c = 10.96(5) Å
Ratio:
a:c = 1 : 1.909
Unit Cell V:
361.11 ų
Z:
2
Morphology:
Grains less than 1mm in diameter, also intergrowths.
Twinning:
Polysynthetic twinning common.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.26 Å | (100) |
| 1.98 Å | (80) |
| 1.72 Å | (70) |
| 2.03 Å | (50) |
| 2.87 Å | (40) |
| 2.74 Å | (30) |
| 1.666 Å | (30) |
Reference:
Comments:
From Tacama, Bolivia
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 3b: Earth’s earliest hydrosphere | >4.45 |
| 12 : Hadean hydrothermal subsurface sulfide deposits (see also #33) |
Geological Setting:
In tin veins.
Type Occurrence of Hocartite
General Appearance of Type Material:
grains and inclusions in sphalerite and wurtzite
Place of Conservation of Type Material:
National School of Mines, Paris, France.
Geological Setting of Type Material:
In hydrothermal tin veins
Associated Minerals at Type Locality:
Synonyms of Hocartite
Other Language Names for Hocartite
Relationship of Hocartite to other Species
Member of:
Other Members of Stannite Group:
| Briartite | Cu2FeGeS4 | Tet. |
| Černýite | Cu2CdSnS4 | Tet. 42m : I42m |
| Famatinite | Cu3SbS4 | Tet. 42m : I42m |
| Ferrokësterite | Cu2FeSnS4 | Tet. 4 : I4 |
| Kësterite | Cu2ZnSnS4 | Tet. 4 : I4 |
| Keutschite | Cu2AgAsS4 | Tet. 42m : I42m |
| Kuramite | Cu3SnS4 | Tet. 42m : I42m |
| Luzonite | Cu3AsS4 | Tet. 42m : I42m |
| Omariniite | Cu8Fe2ZnGe2S12 | Orth. 222 : I222 |
| Permingeatite | Cu3SbSe4 | Tet. 42m : I42m |
| Petrukite | (Cu,Fe,Zn,Ag)3(Sn,In)S4 | Orth. mm2 : Pmn21 |
| Pirquitasite | Ag2ZnSnS4 | Tet. 4 : I4 |
| Richardsite | Zn2CuGaS4 | Tet. 42m : I42m |
| Stannite | Cu2FeSnS4 | Tet. 42m : I42m |
| Stannoidite | Cu+6Cu2+2(Fe2+,Zn)3Sn2S12 | Orth. 222 : I222 |
| 'UM1984-30-S:CuFeSn' | Cu2Fe2Sn3S7 | |
| 'Unnamed (Cu-Zn-In Sulphide)' | CuZn2InS4 | |
| Velikite | Cu2HgSnS4 | Tet. 4 : I4 |
| Zincobriartite | Cu2(Zn,Fe)(Ge,Ga)S4 | Tet. 42m : I42m |
Forms a series with:
Common Associates
Related Minerals - Strunz-mindat Grouping
| 2.CB. | Richardsite | Zn2CuGaS4 |
| 2.CB. | Okruginite | Cu2SnSe3 |
| 2.CB. | Hanswilkeite | KFeS2 |
| 2.CB. | Auroselenide | AuSe |
| 2.CB. | Ruizhongite | (Ag2◻)Pb3Ge2S8 |
| 2.CB. | Agmantinite | Ag2MnSnS4 |
| 2.CB. | Tolstykhite | Au3S4Te6 |
| 2.CB. | Gachingite | Au(Te1-xSex) |
| 2.CB.05a | Hawleyite | CdS |
| 2.CB.05 | 'UM1998-15-S:CuFeZn' | Cu2Fe3Zn5S10 |
| 2.CB.05a | Coloradoite | HgTe |
| 2.CB.05a | Metacinnabar | HgS |
| 2.CB.05a | Tiemannite | HgSe |
| 2.CB.05a | Sphalerite | ZnS |
| 2.CB.05b | Sakuraiite | (Cu,Zn,Fe)3(In,Sn)S4 |
| 2.CB.05c | Polhemusite | (Zn,Hg)S |
| 2.CB.05a | Rudashevskyite | (Fe,Zn)S |
| 2.CB.05a | Stilleite | ZnSe |
| 2.CB.05a | Ishiharaite | (Cu,Ga,Fe,In,Zn)S |
| 2.CB.07a | 'Unnamed (Cu-Mn-Sn Sulphide)' | Cu2MnSnS4 |
| 2.CB.07a | Shenzhuangite | NiFeS2 |
| 2.CB.10b | Talnakhite | Cu9(Fe,Ni)8S16 |
| 2.CB.10b | Haycockite | Cu4Fe5S8 |
| 2.CB.10a | Lenaite | AgFeS2 |
| 2.CB.10a | Gallite | CuGaS2 |
| 2.CB.10a | Roquesite | CuInS2 |
| 2.CB.10a | Eskebornite | CuFeSe2 |
| 2.CB.10a | 'UM1984-30-S:CuFeSn' | Cu2Fe2Sn3S7 |
| 2.CB.10c | Omariniite | Cu8Fe2ZnGe2S12 |
| 2.CB.10a | Chalcopyrite | CuFeS2 |
| 2.CB.10a | 'Unnamed (Cu-Zn-In Sulphide)' | CuZn2InS4 |
| 2.CB.10b | Mooihoekite | Cu9Fe9S16 |
| 2.CB.10a | Laforêtite | AgInS2 |
| 2.CB.10b | Putoranite | Cu1.1Fe1.2S2 |
| 2.CB.15a | Velikite | Cu2HgSnS4 |
| 2.CB.15c | 'UM2006-11-S:CuFeGeZn' | Cu8(Fe,Zn)3Ge2S12 (?) |
| 2.CB.15a | Kësterite | Cu2ZnSnS4 |
| 2.CB.15a | Pirquitasite | Ag2ZnSnS4 |
| 2.CB.15a | Stannite | Cu2FeSnS4 |
| 2.CB.15c | Stannoidite | Cu+6Cu2+2(Fe2+,Zn)3Sn2S12 |
| 2.CB.15b | Mohite | Cu2SnS3 |
| 2.CB.15a | Černýite | Cu2CdSnS4 |
| 2.CB.15a | Idaite | Cu5FeS6 |
| 2.CB.15a | Ferrokësterite | Cu2FeSnS4 |
| 2.CB.15a | Kuramite | Cu3SnS4 |
| 2.CB.17a v | 'Arsenic-bearing Renierite' | Cu11GeAsFe4S16 |
| 2.CB.20 | Mawsonite | Cu6Fe2SnS8 |
| 2.CB.20 | Chatkalite | Cu6FeSn2S8 |
| 2.CB.30 | 'Frieseite' | Ag2Fe5S8 (?) |
| 2.CB.30 | Nekrasovite | Cu26V2(Sn,As,Sb)6S32 |
| 2.CB.30 | 'Argyropyrite' | near Ag2Fe7S11 |
| 2.CB.30 | Maikainite | Cu20(Fe,Cu)6Mo2Ge6S32 |
| 2.CB.30 | Colusite | Cu13VAs3S16 |
| 2.CB.30 | Germanite | Cu13Fe2Ge2S16 |
| 2.CB.30 | Germanocolusite | Cu26V2(Ge,As)6S32 |
| 2.CB.30 | Stibiocolusite | Cu13V(Sb,Sn,As)3S16 |
| 2.CB.30 | Ovamboite | Cu20(Fe,Cu,Zn)6W2Ge6S32 |
| 2.CB.35a | Morozeviczite | (Pb,Fe)3Ge1-xS4 |
| 2.CB.35a | Renierite | (Cu+,Zn)11Fe4(Ge4+,As5+)2S16 |
| 2.CB.35a | Hemusite | Cu6SnMoS8 |
| 2.CB.35b | Catamarcaite | Cu6GeWS8 |
| 2.CB.35a | Vinciennite | Cu+7Cu2+3Fe2+2Fe3+2Sn(As,Sb)S16 |
| 2.CB.35a | Kiddcreekite | Cu6SnWS8 |
| 2.CB.35a | Polkovicite | (Fe,Pb)3(Ge,Fe)1-xS4 |
| 2.CB.40 | Lautite | CuAsS |
| 2.CB.42 | Lingbaoite | AgTe3 |
| 2.CB.45 | Cadmoselite | CdSe |
| 2.CB.45 | Rambergite | MnS |
| 2.CB.45 | Buseckite | (Fe,Zn,Mn)S |
| 2.CB.45 | Maletoyvayamite | Au3Se4Te6 |
| 2.CB.45 | Greenockite | CdS |
| 2.CB.45 | Wurtzite | (Zn,Fe)S |
| 2.CB.47 | Murchisite | Cr5S6 |
| 2.CB.50 | 'Zincselenide' | ZnSe |
| 2.CB.50 | Wassonite | TiS |
| 2.CB.52 | 'Dzhezkazganite' | ReMoCu2PbS6 ? |
| 2.CB.55b | Isocubanite | CuFe2S3 |
| 2.CB.55a | Cubanite | CuFe2S3 |
| 2.CB.60 | Raguinite | TlFeS2 |
| 2.CB.60 | Picotpaulite | TlFe2S3 |
| 2.CB.65 | Argentopyrite | AgFe2S3 |
| 2.CB.65 | Sternbergite | AgFe2S3 |
| 2.CB.70 | Sulvanite | Cu3VS4 |
| 2.CB.75 | Vulcanite | CuTe |
| 2.CB.80 | Empressite | AgTe |
| 2.CB.85 | Muthmannite | AuAgTe2 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Hocartite
mindat.org URL:
https://www.mindat.org/min-1911.html
Please feel free to link to this page.
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References for Hocartite
Localities for Hocartite
Showing 35 localities.
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Argentina | |
| Silver Standard Resources Inc |
| Slater (2016) | |
| Paar et al. (2000) |
| Paar (2013) | |
Austria | |
| Pichler (2009) |
| Feitzinger et al. (1995) |
Bolivia | |
| unpublished COMIBOL analysis |
| Kempff et al. (La Paz, 2009) +1 other reference |
| Franco (2018) |
| Kempff et al. (La Paz, 2009) |
| Wilson (2001) |
| Salomon Rivas y Federico Ahlfeld (1998) |
| Wilson (2001) |
| American Mineralogist: 54 |
| Kempff et al. (La Paz, 2009) | |
| Kempff et al. (La Paz, 2009) +1 other reference | |
| Salomon Rivas y Federico Ahlfeld (1998) | |
China | |
| Weining Zhou (1994) |
| Peng et al. (1999) |
| Peng et al. (1999) | |
| Weining Zhou (1994) |
| Leiming Xu et al. (1993) +1 other reference |
| Xinpei Jiang (1994) |
France | |
| ? Bull. Soc. fr. Min. Crist. (1968) |
Germany | |
| Weiß (1990) |
Japan | |
| Nitta & Akiyama (1981) |
| Min. Jour. (Japan) +2 other references |
Kyrgyzstan | |
| Pekov (1998) |
Peru | |
| Imai et al. (1985) +1 other reference |
Russia | |
| [World of Stones 12:49] | |
| Gamyanin G.N. et al. (2001) +1 other reference |
Slovakia | |
| Duda et. all. |
USA | |
| Graeme (1993) |
| Graeme (1993) +1 other reference | |
| Castor et al. (2004) |
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The
Pirquitas Mine, Mina Pirquitas, Rinconada Department, Jujuy Province, Argentina