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Cupropolybasite

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Formula:
[Cu6Sb2S7][Ag9CuS4]
System:
Trigonal
Hardness:
3 - 3½
Name:
For the mineral polybasite and its copper content.
Rare member of the pearceite-polybasite group.

Classification of Cupropolybasite

Approved
Approval Year:
2008
2.GB.15

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
G : Sulfarsenites, sulfantimonites, sulfbismuthites
B : Neso-sulfarsenites, etc. with additional S
3.1.7.3

3 : SULFOSALTS
1 : ø > 4
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Type Occurrence of Cupropolybasite

General Appearance of Type Material:
subhedral to anhedral grain morphology
Place of Conservation of Type Material:
Mineralogical Collection of the Royal Ontario Museum, Department of Natural History, Ontario (Canada). (sample M12128)
Geological Setting of Type Material:
epithermal silver-gold deposit
Associated Minerals at Type Locality:

Physical Properties of Cupropolybasite

Metallic
Diaphaneity (Transparency):
Opaque
Streak:
black
Hardness (Mohs):
3 - 3½
Hardness (Vickers):
VHN100=129 kg/mm2
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
None observed
Density:
6.310 g/cm3 (Calculated)

Crystallography of Cupropolybasite

Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
P3 1m
Cell Parameters:
a = 7.3277(3) Å, c = 11.7752(6) Å
Ratio:
a:c = 1 : 1.607
Unit Cell Volume:
V 547.56 ų (Calculated from Unit Cell)
Z:
1
X-Ray Powder Diffraction Data:
d-spacingIntensity
11.81 (44)
3.069 (44)
2.951 (100)
2.799 (52)
2.473 (43)
2.355 (40)
2.163 (43)
1.835 (46)

Optical Data of Cupropolybasite

Type:
Anisotropic
Bireflectance:
moderately bireflectant
Internal Reflections:
none
Pleochroism:
Weak
Comments:
light-grey to a blue grey

Chemical Properties of Cupropolybasite

Formula:
[Cu6Sb2S7][Ag9CuS4]
All elements listed in formula:

Relationship of Cupropolybasite to other Species

Other Members of Group:
Benleonardite[Ag6(Sb,As)2S6Te] [Ag9Cu(S,Te)2Te2]
Cupropearceite[Cu6As2S7][Ag9CuS4]
Pearceite[(Ag,Cu)6(As,Sb)2S7][Ag9CuS4]
Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
Selenopolybasite[(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2]
2.GB.05ArgentotennantiteAg6[Cu4(Fe,Zn)2]As4S13
2.GB.05FreibergiteAg6[Cu4Fe2]Sb4S13-x
2.GB.05GirauditeCu6[Cu4(Fe,Zn)2]As4Se13
2.GB.05GoldfielditeCu10Te4S13
2.GB.05HakiteCu6[Cu4Hg2]Sb4Se13
2.GB.05TennantiteCu6[Cu4(Fe,Zn)2]As4S13
2.GB.05TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
2.GB.10SelenostephaniteAg5Sb(Se,S)4
2.GB.10StephaniteAg5SbS4
2.GB.15Pearceite[(Ag,Cu)6(As,Sb)2S7][Ag9CuS4]
2.GB.15Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
2.GB.15UM2003-14-S:AgBiFeTeAg16FeBiTe3S8
2.GB.15Selenopolybasite[(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2]
2.GB.15Cupropearceite[Cu6As2S7][Ag9CuS4]
2.GB.15UM1979-17-S:BiCuFe~Cu18Fe4BiS16
2.GB.20Galkhaite(Cs,Tl)(Hg,Cu,Zn)6(As,Sb)4S12

Other Names for Cupropolybasite

Name in Other Languages:

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 Cupropolybasite

Reference List:
Bindi, L., M. Evain, P.G. Spry, K.T. Tait & S. Menchetti (2007): Structural role of copper in the minerals of the pearceite-polybasite group: the case of the new minerals cupropearceite and cupropolybasite. Mineralogical Magazine 71, 641-650.

Internet Links for Cupropolybasite

Localities for Cupropolybasite

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.
Canada (TL)
 
  • British Columbia
    • Skeena Mining Division
      • Stewart
Bindi L, Evain M, Spry P G, Tait K T, Menchetti S (2007) Structural role of copper in the minerals of the pearceite-polybasite group: the case of the new minerals cupropearcite and cupropolybasite. Mineralogical Magazine 71, 641-650
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Central Bohemia Region
      • Příbram
        • Vrančice
          • Alexander Shaft (Alexander Mine)
Sejkora, J., Pauliš, P., Litochleb, J., Novák, F. (2010): Příspěvek k chemickému složení minerálů skupiny pearceit-polybazit z Vrančic u Příbrami (Česká republika) [Contribution to chemical composition of the minerals of pearceite-polybasite group from Vrančice near Příbram (Czech Republic). Bulletin mineralogicko-petrologického oddělení 18 (2), 23-31. [containing minor Cl]
Indonesia
 
  • Sulawesi Island (Celebes Island)
    • Sulawesi Selatan Province (South Sulawesi Province)
      • Gowa
Nur, I., Idrus, A., Pramumijoyo, S., Harijoko, A., Watanabe, K., Imai, A., ... & Irfan, U. R. (2012). Elemental Mass Balance of the Hydrothermal Alteration Associated with the Baturappe Epithermal Silver-Base Metal Prospect, South Sulawesi, Indonesia.
Namibia
 
  • Otjikoto Region (Oshikoto)
    • Tsumeb
Bindi et al. (2015) How much copper can the pearceite structure sustain? The case of cupropearceite from Tsumeb, Namibia. Periodico di Mineralogia 84: 341-350.
Switzerland
 
  • Wallis (Valais)
    • Bagnes Valley
      • Bruson
Cuchet, S., Ansermet, S. & Meisser, N. (2012): Die kupferhaltige Mineralisierung am Six Blanc im Wallis. Schweizer Strahler 46 (4), 2-16 (in German and French).
Mineral and/or Locality  
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