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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.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.
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 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]
  • 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 (Otjikoto 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).
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