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Eta-bronze

Valid as an unnamed mineral

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Formula:

Cu₆Sn₅

Colour:

White to bronze

Lustre:

Metallic

Hardness:

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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Unique IdentifiersHide

Mindat ID:

785

Long-form identifier:

mindat:1:1:785:0

GUID
(UUID V4):

cc682eba-e9e3-4b54-98f6-6168ddbba8f9

IMA Classification of Eta-bronzeHide

IMA status notes:

Unnamed (probably valid)

Approval history:

Unnamed, but probably valid.

Classification of Eta-bronzeHide

Strunz-mindat (2024):

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

Lustre:

Metallic

Colour:

White to bronze

Hardness:

2 on Mohs scale

Chemistry of Eta-bronzeHide

Mindat Formula:

Cu₆Sn₅

Elements listed:

Cu, Sn - search for minerals with similar chemistry

Crystallography of Eta-bronzeHide

Crystal System:

Hexagonal

Synonyms of Eta-bronzeHide

Related Minerals - Strunz-mindat Grouping Hide

1.AC.05	Indium	In	Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
1.AC.10	Tin	Sn	Tet. 4/mmm (4/m 2/m 2/m) : I4₁/amd
1.AC.15	Sorosite	Cu_1+x(Sn,Sb)	Hex. 6/mmm (6/m 2/m 2/m) : P6₃/mmc
1.AC.15	Yuanjiangite	AuSn	Hex. 6/mmm (6/m 2/m 2/m) : P6₃/mmc
1.AC.15	UM1965-07-E:CuSn	Cu₃Sn
1.AC.20	Rumoiite	AuSn₂	Orth. mmm (2/m 2/m 2/m) : Pbca

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.

Internet Links for Eta-bronzeHide

mindat.org URL:

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References for Eta-bronzeHide

Reference List:

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.

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

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Locality ListHide

- 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). ~~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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.


Portugal
Castelo Branco Covilhã São Jorge da Beira ⓘ Panasqueira Mines

Russia
Chukotka Autonomous Okrug Okhotsk-Chukotka belt ⓘ Kubaka deposit	[AmMin 82:821]
Sakha Northern Yakutia Olenyok (Olenek) river basin West Ukukit kimberlite field ⓘ "Leningrad" kimberlite pipe ?	Koval'skii et al. (1985) +1 other reference

USA
U.S. Virgin Islands ⓘ St Croix	Alminas +2 other references
St Thomas ⓘ Charlotte Amalie harbor	Alminas +2 other references

Uzbekistan
Sirdaryo North Nuratau Range ⓘ Elkiaidai Stream	Pekov (1998)

The Moon
Mare Crisium ⓘ Luna 24 landing site	Mokhov et al. (2008)

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