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Eta-bronze

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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'.


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Classification of Eta-bronzeHide

Notes:
Unnamed (probably valid)
Approval History:
Unnamed, but probably valid.
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

Physical Properties of Eta-bronzeHide

Metallic
Colour:
White to bronze
Hardness:

Chemical Properties of Eta-bronzeHide

Formula:
Cu6Sn5
Idealised Formula:
Cu1.2Sn

Crystallography of Eta-bronzeHide

Crystal System:
Hexagonal

Synonyms of Eta-bronzeHide

Related Minerals - Nickel-Strunz GroupingHide

1.AC.05IndiumInTet.
1.AC.10TinSnTet. 4/mmm (4/m 2/m 2/m) : I41/amd
1.AC.15SorositeCu1+x(Sn,Sb), where 0.1 ≤ x ≤ 0.2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
1.AC.15YuanjiangiteAuSnHex.
1.AC.15UM1965-07-E:CuSnCu3Sn

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 Eta-bronzeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Koval'skii, V.V., Oleinikov, O.B. (1985): Native metals and natural polymineralic alloys of copper, zinc, lead, tin and antimony in rocks from the "Leningrad" kimberlite pipe. Doklady Akademii Nauk SSSR: 285: 203-208; in: Hawthorne, F.C., Bladh, K.W., Burke, E.A.J., Grew, E.S., Langley, R.H., Puziewicz, J., Roberts, A.C., Shigley, J.E., Vanko, D.A. (1987): New mineral Names. American Mineralogist: 72: 227.
Mokhov, A.V., Kartashov, P.M., et al. (2008): Find of unusual complex oxides and n-Bronze in Lunar Regolith. Doklady Earth Sciences: 421A: 923-925.

Internet Links for Eta-bronzeHide

Localities for Eta-bronzeHide

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.
Portugal
 
  • Castelo Branco District
    • Covilhã
No reference listed
Russia
 
  • Eastern-Siberian Region
    • Sakha Republic (Yakutia)
      • Northern Yakutia
        • Olenyok (Olenek) river basin
Koval'skii, V.V., Oleinikov, O.B. (1985): Native metals and natural polymineralic alloys of copper, zinc, lead, tin and antimony in rocks from the "Leningrad" kimberlite pipe. Doklady Akademii Nauk SSSR: 285: 203-208; in: Hawthorne, F.C., Bladh, K.W., Burke, E.A.J., Grew, E.S., Langley, R.H., Puziewicz, J., Roberts, A.C., Shigley, J.E., Vanko, D.A. (1987): New mineral Names. American Mineralogist: 72: 227
  • Far-Eastern Region
    • Chukotskii Autonomous Okrug
      • Okhotsk-Chukotka belt
[AmMin 82:821]
USA
 
  • U.S. Virgin Islands
Alminas, Henry V.; Foord, Eugene E.; Tucker, Robert E. (1994) Geochemistry, mineralogy, and geochronology of the U.S. Virgin Islands USGS Bulletin 2057 36p
    • St Thomas
Alminas, Henry V.; Foord, Eugene E.; Tucker, Robert E. (1994) Geochemistry, mineralogy, and geochronology of the U.S. Virgin Islands USGS Bulletin 2057 36p
Uzbekistan
 
  • Sidaryo Viloyati (Syrdar'ya)
    • North Nuratau Range
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
The Moon
 
  • Mare Crisium
Mokhov, A.V., Kartashov P.M., e.a. (2008) Find of unusual complex oxides and n-Bronze in Lunar Regolith, Doklady Earth Sciences 421A, pp. 923-925.
Mineral and/or Locality  
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