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3 - 3½
Specific Gravity:
6.310 (Calculated)
Crystal System:
For the mineral polybasite and its copper content.
Rare member of the pearceite-polybasite group.

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Classification of CupropolybasiteHide

Approval Year:

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

1 : ø > 4

Physical Properties of CupropolybasiteHide

3 - 3½ on Mohs scale
VHN100=129 kg/mm2 - Vickers
None Observed
None observed
6.310 g/cm3 (Calculated)

Optical Data of CupropolybasiteHide

moderately bireflectant
Internal Reflections:
light-grey to a blue grey

Chemical Properties of CupropolybasiteHide


Crystallography of CupropolybasiteHide

Crystal System:
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
P3 1m
Cell Parameters:
a = 7.3277(3) Å, c = 11.7752(6) Å
a:c = 1 : 1.607
Unit Cell V:
547.56 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
11.81 (44)
3.069 (44)
2.951 (100)
2.799 (52)
2.473 (43)
2.355 (40)
2.163 (43)
1.835 (46)

Type Occurrence of CupropolybasiteHide

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:

Synonyms of CupropolybasiteHide

Relationship of Cupropolybasite to other SpeciesHide

Other Members of this group:
Benleonardite[Ag6(Sb,As)2S6Te] [Ag9Cu(S,Te)2Te2]Trig. 3m (3 2/m) : P3m1
Cupropearceite[Cu6As2S7][Ag9CuS4]Trig. 3m (3 2/m) : P3m1
Pearceite[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]Trig. 3m (3 2/m) : P3m1
Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]Mon. 2/m : B2/m
Selenopolybasite[(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2]Trig. 3m (3 2/m) : P3m1

Related Minerals - Nickel-Strunz GroupingHide

2.GB.05ArgentotennantiteAg6[Cu4(Fe,Zn)2]As4S13Iso. 4 3m : I4 3m
2.GB.05FreibergiteAg6[Cu4Fe2]Sb4S13-xIso. 4 3m : I4 3m
2.GB.05GirauditeCu6[Cu4(Fe,Zn)2]As4Se13Iso. 4 3m : I4 3m
2.GB.05GoldfielditeCu10Te4S13Iso. 4 3m : I4 3m
2.GB.05HakiteCu6[Cu4Hg2]Sb4Se13Iso. 4 3m : I4 3m
2.GB.05TennantiteCu6[Cu4(Fe,Zn)2]As4S13Iso. 4 3m : I4 3m
2.GB.05TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13Iso. 4 3m : I4 3m
2.GB.05ArgentotetrahedriteAg6Cu4(Fe,Zn)2Sb4S13Iso. 4 3m : I4 3m
2.GB.10StephaniteAg5SbS4Orth. mm2 : Cmc21
2.GB.15Pearceite[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]Trig. 3m (3 2/m) : P3m1
2.GB.15Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]Mon. 2/m : B2/m
2.GB.15Selenopolybasite[(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2]Trig. 3m (3 2/m) : P3m1
2.GB.15Cupropearceite[Cu6As2S7][Ag9CuS4]Trig. 3m (3 2/m) : P3m1
2.GB.20Galkhaite(Cs,Tl)(Hg,Cu,Zn)6(As,Sb)4S12Iso. 4 3m : I4 3m

Related Minerals - Dana Grouping (8th Ed.)Hide[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]Mon. 2/m : B2/m[(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2]Trig. 3m (3 2/m) : P3m1

Other InformationHide

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 CupropolybasiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 CupropolybasiteHide

Localities for CupropolybasiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Sofiya Oblast (Sofia Oblast)
    • Zlatitsa Obshtina
      • Zlatitsa
Mladenova, V., Apostolova, R., & Ivanov, Z. (2017). Epithermal intermediate-sulfidation veins in the low-grade metamorphic rocks in the upper levels of the Elatsite porphyry copper deposit, Bulgaria. Review of the Bulgarian Geological Society, 78.
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
  • Central Bohemian 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]
  • Sulawesi (Celebes)
    • 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.
  • Oshikoto Region
    • 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.
  • 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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