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Geerite

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Formula:
Cu8S5
System:
Trigonal
Hardness:
3½ - 4
Name:
Named after Adam Geer (deceased), of Utica, N.Y., who collected the mineral.
May be partly or completely replaced by spionkopite.
Structurally closely related to digenite.

Classification of Geerite

Approved 1978
2.BA.05

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
A : With Cu, Ag, Au
3.1.7

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
1 : Sulphides etc. of Cu
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Type Occurrence of Geerite

Place of Conservation of Type Material:
Smithsonian
Year of Discovery:
1978
Geological Setting of Type Material:
Replacement of sphalerite

Occurrences of Geerite

Geological Setting:
Serpentine hosted chromite-magnetite deposit

Physical Properties of Geerite

Metallic
Diaphaneity (Transparency):
Opaque
Hardness (Mohs):
3½ - 4
Hardness (Vickers):
VHN25=75 - 96 kg/mm2
Density:
5.61 g/cm3 (Calculated)

Crystallography of Geerite

Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Cell Parameters:
a = 3.83Å, c = 46.84Å
Ratio:
a:c = 1 : 12.23
Unit Cell Volume:
V 595.04 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Coatings and thin platelets
Comment:
Space group R-3m, R3m or R32. Structure undetermined(?).
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.128 (100)
2.712 (10)
1.918 (50)
1.870 (10)
1.683 (10)
1.637 (30)
1.109 (20)
Comments:
Close to data of sphalerite.

Optical Data of Geerite

Type:
Anisotropic
Anisotropism:
Moderate in yellows
Colour in reflected light:
Bluish white
Pleochroism:
Weak

Chemical Properties of Geerite

Formula:
Cu8S5
Essential elements:
All elements listed in formula:
Common Impurities:
Fe,Zn

Relationship of Geerite to other Species

2.BA.05ChalcociteCu2S
2.BA.05DjurleiteCu31S16
2.BA.05RoxbyiteCu9S5
2.BA.10AniliteCu7S4
2.BA.10DigeniteCu9S5
2.BA.15BorniteCu5FeS4
2.BA.20BellidoiteCu2Se
2.BA.20BerzelianiteCu2Se
2.BA.25AthabascaiteCu5Se4
2.BA.25UmangiteCu3Se2
2.BA.30RickarditeCu7Te5
2.BA.30WeissiteCu2-xTe
2.BA.35AcanthiteAg2S
2.BA.40MckinstryiteAg5-xCu3+xS4
2.BA.40StromeyeriteAgCuS
2.BA.40dUM2003-13-S:AgAuCuAg6AuCu2S5
2.BA.45JalpaiteAg3CuS2
2.BA.45SelenojalpaiteAg3CuSe2
2.BA.50EucairiteAgCuSe
2.BA.55AguilariteAg4SeS
2.BA.55NaumanniteAg2Se
2.BA.60CervelleiteAg4TeS
2.BA.60HessiteAg2Te
2.BA.60ChenguodaiteAg9Fe3+Te2S4
2.BA.65Henryite(Cu,Ag)3+xTe2 , with x ~ 0.40
2.BA.65StütziteAg5-xTe3, x = 0.24-0.36
2.BA.70ArgyroditeAg8GeS6
2.BA.70CanfielditeAg8SnS6
2.BA.70Putzite(Cu4.7Ag3.3)GeS6
2.BA.75FischesseriteAg3AuSe2
2.BA.75Penzhinite(Ag,Cu)4Au(S,Se)4
2.BA.75PetrovskaiteAuAg(S,Se)
2.BA.75PetziteAg3AuTe2
2.BA.75UytenbogaardtiteAg3AuS2
2.BA.80Bezsmertnovite(Au,Ag)4Cu(Te,Pb)
2.BA.80BilibinskitePbCu2Au3Te2
2.BA.80Bogdanovite(Au,Te,Pb)3(Cu,Fe)
3.1.1ChalcociteCu2S
3.1.2DjurleiteCu31S16
3.1.3DigeniteCu9S5
3.1.4AniliteCu7S4
3.1.5RoxbyiteCu9S5
3.1.6SpionkopiteCu39S28
3.1.8CovelliteCuS
3.1.9BerzelianiteCu2Se
3.1.10BellidoiteCu2Se
3.1.11UmangiteCu3Se2
3.1.12YarrowiteCu9S8
3.1.13AthabascaiteCu5Se4
3.1.14KlockmanniteCuSe
3.1.15Krut'aiteCuSe2
3.1.16WeissiteCu2-xTe
3.1.17RickarditeCu7Te5
3.1.18VulcaniteCuTe
3.1.19BambollaiteCu(Se,Te)2
3.1.20LautiteCuAsS
3.1.21MgriiteCu3AsSe3
3.1.22CubaniteCuFe2S3
3.1.23BorniteCu5FeS4
3.1.24FukuchiliteCu3FeS8
3.1.25ChalcopyriteCuFeS2
3.1.26MooihoekiteCu9Fe9S16
3.1.27HaycockiteCu4Fe5S8
3.1.28IsocubaniteCuFe2S3
3.1.29IdaiteCu5FeS6
3.1.30NukundamiteCu3.4Fe0.6S4
3.1.31PutoraniteCu9(Fe,Ni)9S16
3.1.32Orickite2CuFeS2 · H2O
3.1.33EskeborniteCuFeSe2
3.1.34Chaméanite(Cu,Fe)4As(Se,S)4
3.1.35TalnakhiteCu9(Fe,Ni)8S16

Other Names for Geerite

Name in Other Languages:
German:Geerit
Simplified Chinese:吉硫铜矿
Spanish:Geerita

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.

References for Geerite

Reference List:
Goble, R.J. and G. Robinson (1980): Geerite, Cu1.60S, a new copper sulfide from Dekalb Township, New York. Can. Mineral., 18, 519–523.

American Mineralogist: 66: 1274.

Economou, M.I. (1981): A second occurrence of the copper sulfides geerite and spionkopite in Eretria area, central Greece. Neues Jahrb. Mineral., Monatsh., 489–494.

Goble, R.J. (1985): The relationship between crystal structure, bonding and cell dimensions in the copper sulfides. Can. Mineral., 23, 61–76.

Internet Links for Geerite

Localities for Geerite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Atlantic Ocean
 
  • Mid-Atlantic Ridge complex
Gablina, I.F., Semkova, T.A., Stepanova, T.V., and Gor'kova, N.V. (2006): Lithology and Mineral Resources 41(1), 27-44.
Australia
 
  • Queensland
    • Mount Isa - Cloncurry area
      • Cloncurry District
      • Gunpowder District
        • Mount Gordon
Richardson, S.M. and Day, A.D. (1997) Geology of the Esperanza copper deposit. Proceedings of the 3rd International Mining Geology Conference, Launceston. pg. 51-56
  • Victoria
    • Swan Hill Rural City
      • Lake Boga
Austria
 
  • Styria
    • Knittelfeld
      • Flatschach
J.Raith+ T.Leitner+ W.Paar (2015)
Canada
 
  • Québec
    • Bas-Saint-Laurent
      • Témiscouata RCM
        • Lac Témiscouata
Mineralium Deposita 44 (2009) 285-301
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Plzeň Region
      • Sušice (Schüttenhofen)
Litochleb J., Sejkora J., Šrein V., Malec J.: Kašperskohorské zlato (Šumava, Česká republika). Bulletin Mineralogicko-petrografického oddělení Národního muzea v Praze, 2009, roč. 17, č. 1, s. 1-13.
Democratic Republic of Congo (Zaïre)
 
  • Katanga (Shaba)
    • Katanga Copper Crescent
      • Kolwezi District
        • Kolwezi
Can.Min. 46,19-31(2008)
Germany
 
  • Baden-Württemberg
    • Black Forest
      • Wolfach
        • Oberwolfach
          • Rankach valley
Walenta, K. (1992): Die Mineralien des Schwarzwaldes. Chr. Weise Verlag, München, 336 pp. (in German)
  • North Rhine-Westphalia
    • Bergisches Land
      • Eckenhagen
        • Tillkausen
Weiss: "Mineralfundstellen, Deutschland West", 1990
Greece
 
  • Sterea Hellas Department
    • Fthiótis Prefecture
      • Lamia
        • Othrys Mt ophiolite complex (Othris)
Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
Iran
 
  • Yazd Province
    • Ardakan County
      • Ardakan (Ardekan)
http://www.fos.ut.ac.ir/~journal/G.80.1E_2.htm
Italy
 
  • Trentino-Alto Adige (Trentino-Südtirol)
    • Trento Province
      • Valsugana
        • Vignola-Falesina
Paolo Gasparetto, Erica Bittarello, Andrea Canal, Lara Casagrande, Marco E. Ciriotti, Bruno Fassina, Paolo Ferretti, Sergio Pegoraro, Fabio Tosato, Paolo Zammatteo (2014): I lavori minerari del Rio Ricet, Vignola, Falesina, Trento. Micro, 12, 50-123.
  • Veneto
    • Vicenza Province
      • Torrebelvicino
        • Mercanti Valley
Pegoraro S., Orlandi P., Chiereghin P., Contin.A. and Toniolo E. (2009): I minerali del Monte Trisa, Torrebelvicino, Vicenza. Rivista Mineralogica Italiana, No. 3, 160-179
Japan
 
  • Honshu Island
    • Chubu Region
      • Shizuoka Prefecture
        • Shimoda City
          • Rendaiji
Matsubara, S. & Miyawaki, R. (2006) Catalogue of Japanese Minerals (National Science Museum)
Poland
 
  • Lower Silesia (Dolnośląskie)
    • Legnica
      • Lubin District
Kucha H. 2007: Mineralogia kruszcowa i geochemia ciała rudnego złoża Lubin-Sieroszowice. Biuletyn PIG, vol. 423, pp. 77-94
      • Polkowice District
Jadwiga PIECZONKA, Adam PIESTRZYŃSKI, Jacek MUCHA, Adam GŁUSZEK, Maciej KOTARBA, Dariusz WIĘCŁAW (2008): The red-bed-type precious metal deposit in the Sieroszowice-Polkowice copper mining district, SW Poland. Annales Societatis Geologorum Poloniae 78, 151-280.
Spain
 
  • Catalonia
    • Lleida (Lérida)
      • El Pallars Jussà
        • La Vall Fosca
          • La Torre de Cabdella (La Torre de Capdella)
            • Castell-estaó
- Castillo,M.,Torró,L.,Campeny,M.,Villanova,C.,Tauler,E.,Melgarejo,J.C.(2009) "Mineralogía del Depósito de Uranio Eureka (Castell-estaó, Pirineo, Cataluña) " Soc. Esp. de Mineralogía, Revista Macla nº 11 pp. 53-54. Madrid.
Switzerland
 
  • Grischun (Grisons; Graubünden)
    • Vorderrhein Valley
      • Tujetsch (Tavetsch)
        • Curnera Valley
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): Mineralienlexikon der Schweiz. Wepf (Basel), p. 109.
UK
 
  • England
    • Warwickshire
      • Nuneaton
UKJMM 26:43-51
  • Wales
    • Powys
      • Old Radnor
        • Wethel
Cotterell TF et al (2011) The mineralogy of Dolyhir quarry, Old Radnor. Powys, Wales. UKJMM 32:5-61
USA
 
  • Arizona
    • Greenlee Co.
      • Shannon Mts
        • Copper Mountain District (Clifton-Morenci District)
Merritt Stephen Enders (2000) The Evolution of Supergene Enrichment in the Morenci Porphyry Copper Deposit, Greenlee County, Arizona. PhD Thesis, University of Arizona
  • New Mexico
    • Sierra Co.
      • Chloride District
        • Chloride
Northrop, Minerals of New Mexico, 3rd Rev. Ed., 1996
  • New York
    • St. Lawrence Co.
      • De Kalb Township
Canadian Mineralogist Vol. 18, pp. 519-523 (1980)
Mineral and/or Locality  
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