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UM1992-21-S:AgFeSb

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Formula:
Ag6Ag4Fe2+2Sb4S12S
Crystal System:
Isometric
Almost certainly not identical to now recognized argentotetrahedrite (also differs in the unit cell parameter).

The species seems to be the Fe analogue of rozhdestvenskayaite.

Forms aggregates, 0.002-0.03 mm in diameter, in cavities of siderite; associates: argentian pyrite, tetrahedrite. May also reside in a silver amalgam.


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Classification of UM1992-21-S:AgFeSbHide

Notes:
Unnamed (probably valid)

Optical Data of UM1992-21-S:AgFeSbHide

Type:
Isotropic
Colour in reflected light:
gray with a bluish hue
Internal Reflections:
very rare, dark cherry red

Chemical Properties of UM1992-21-S:AgFeSbHide

Formula:
Ag6Ag4Fe2+2Sb4S12S

Crystallography of UM1992-21-S:AgFeSbHide

Crystal System:
Isometric
Cell Parameters:
a = 10.92 Å
Unit Cell V:
1,302.17 ų (Calculated from Unit Cell)
Comment:
the a parameter may increase with Ag content

Relationship of UM1992-21-S:AgFeSb to other SpeciesHide

Other Members of this group:
Argentotennantite-(Zn)Ag6(Cu4Zn2)As4S12SIso. 4 3m : I4 3m
Argentotetrahedrite-(Fe)Ag6(Cu4Fe2)Sb4S12SIso. 4 3m : I4 3m
Cd-hakite(Cu,Ag)6Cu4(Cd,Zn,Cu,Hg)2(Sb,As)4(Se,S)13
Freibergite(Ag,Cu,◻)10Fe2+2Sb4S12Iso. 4 3m : I4 3m
GirauditeCu6Cu4(Fe2+,Zn)2As4Se12SIso. 4 3m : I4 3m
Goldfieldite(Cu102)Te4S12SIso. 4 3m : I4 3m
Hakite-(Hg)Cu6Cu4Hg2Sb4Se12SeIso. 4 3m : I4 3m
Kenoargentotetrahedrite-(Fe)[Ag6]4+(Ag4Fe2+2)Sb4S12
Rozhdestvenskayaite-(Zn)Ag6Ag4Zn2Sb4S12SIso. 4 3m : I4 3m
Tennantite-(Fe)Cu6(Cu4Fe2)As4S12S
Tennantite-(Zn)Cu6(Cu4Zn2)As4S12S
Tetrahedrite-(Fe)Cu6(Cu4Fe2)Sb4S12S
Tetrahedrite-(Hg)Cu6(Cu4Hg2)Sb4S12SIso. 4 3m : I4 3m
Tetrahedrite-(Zn)Cu6(Cu4Zn2)Sb4S12S
Unnamed (As-analogue of Rozhdestvenskayaite-(Zn))Ag6Ag4Zn2As4S12S
Unnamed (Fe-analogue of Argentotennantite-(Zn))Ag6(Cu4Fe2)As4S12S
Unnamed (Zn-analogue of Argentotetrahedrite-(Fe))Ag6(Cu4Zn2)Sb4S12S
Zn-hakite(Cu,Ag)6Cu4(Zn,Hg,Cd,Cu)2(Sb,As)4(Se,S)13

Other InformationHide

Notes:
unaffected by light
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 UM1992-21-S:AgFeSbHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Zhdatov, Yu.Ya., Amuzinskiy, V.A., Andrianov, N.G. (1992): A natural variety of silver-rich tetrahedrite with a large unit-cell parameter. Doklady Akad' Nauk SSSR: 326(2): 337 -340 (in Russian); in: Jambor, J.L., Grew, E.S. (1994): New mineral Names. American Mineralogist: 79: 390
Smith, D.G.W., Nickel, E.H. (2007): A System of Codification for Unnamed Minerals: Report of the SubCommittee for Unnamed Minerals of the IMA Commission on New Minerals, Nomenclature and Classification. Canadian Mineralogist: 45: 983-1055; http://nrmima.nrm.se (2016)

Internet Links for UM1992-21-S:AgFeSbHide

Localities for UM1992-21-S:AgFeSbHide

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.
Russia
 
  • Sakha Republic (Yakutia)
    • Verkhoyansk Fold Belt
      • Verkhoyansk Silver Province
        • Khachakchan ore cluster
Zhdatov, Yu.Ya., Amuzinskiy, V.A., Andrianov, N.G. (1992): A natural variety of silver-rich tetrahedrite with a large unit-cell parameter. Doklady Akad' Nauk SSSR: 326(2): 337 -340 (in Russian); in: Jambor, J.L., Grew, E.S. (1994): New mineral Names. American Mineralogist: 79: 390
 
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