Eta-bronze
Valid as an unnamed mineral
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Formula:
Cu6Sn5
Colour:
White to bronze
Lustre:
Metallic
Hardness:
2
Crystal System:
Hexagonal
Reported natural occurrence of the alloy in oxidised tin ores. Compare with Stanniferous Copper.
Originally reported from Panasqueira Mines, Panasqueira, Covilhã, Castelo Branco District, Portugal.
Synonymous with 'UM1965-06-E:CuSn'. Compare 'bronze', sorosite, 'UM1978-02-E:CuPbSn', and 'UM1965-07-E:CuSn'.
A phase corresponding to Cu6Sn5 is also reported from a Russian kimberlite, where it is associated with 'UM1985-05-E:CuSn' (another Cu-Sn intermetallide) and 'UM1985-04-E:CuNiSn'.
Originally reported from Panasqueira Mines, Panasqueira, Covilhã, Castelo Branco District, Portugal.
Synonymous with 'UM1965-06-E:CuSn'. Compare 'bronze', sorosite, 'UM1978-02-E:CuPbSn', and 'UM1965-07-E:CuSn'.
A phase corresponding to Cu6Sn5 is also reported from a Russian kimberlite, where it is associated with 'UM1985-05-E:CuSn' (another Cu-Sn intermetallide) and 'UM1985-04-E:CuNiSn'.
Unique Identifiers
Mindat ID:
785
Long-form identifier:
mindat:1:1:785:0
IMA Classification of Eta-bronze
IMA status notes:
Unnamed (probably valid)
Approval history:
Unnamed, but probably valid.
Classification of Eta-bronze
1.AC.15
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
A : Metals and Intermetallic Alloys
C : Indium-tin family
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
A : Metals and Intermetallic Alloys
C : Indium-tin family
Physical Properties of Eta-bronze
Chemistry of Eta-bronze
Mindat Formula:
Cu6Sn5
Elements listed:
Crystallography of Eta-bronze
Crystal System:
Hexagonal
Synonyms of Eta-bronze
Related Minerals - Strunz-mindat Grouping
| 1.AC.05 | Native Indium | In |
| 1.AC.10 | Native Tin | Sn |
| 1.AC.15 | 'UM1965-07-E:CuSn' | Cu3Sn |
| 1.AC.15 | Sorosite | Cu1+x(Sn,Sb) |
| 1.AC.15 | Yuanjiangite | AuSn |
| 1.AC.20 | Rumoiite | AuSn2 |
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 Eta-bronze
mindat.org URL:
https://www.mindat.org/min-785.html
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References for Eta-bronze
Reference List:
Localities for Eta-bronze
Showing 7 localities.
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The 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.
Portugal | |
Russia | |
| [AmMin 82:821] |
| Koval'skii et al. (1985) +1 other reference |
USA | |
| Alminas +2 other references |
| Alminas +2 other references |
Uzbekistan | |
| Pekov (1998) |
The Moon | |
| Mokhov et al. (2008) |
