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Alburnite

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04050320014947745996181.jpg
View of Roșia Montană and surrounding gold mines, ca. 1900.

Roşia Montană, Roşia Montanã Commune, Alba, Romania
Formula:
Ag8GeTe2S4
Lustre:
Metallic
Hardness:
4
Specific Gravity:
7.828 (Calculated)
Crystal System:
Isometric
Name:
Derived from the Latin name of the deposit. The Roşia Montana Au-Ag deposit was known during the Roman period (106-273 AD) as Alburnus Maior.
Closely related to the argyrodite-canfieldite series (which contains no Te).


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Classification of AlburniteHide

Approved
2.BA.

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
A : With Cu, Ag, Au

Physical Properties of AlburniteHide

Metallic
Transparency:
Opaque
Hardness:
Cleavage:
None Observed
Density:
7.828 g/cm3 (Calculated)

Optical Data of AlburniteHide

Type:
Isotropic
Bireflectance:
none
Colour in reflected light:
gray-blue with a bluish tint
Internal Reflections:
none observed in air
Pleochroism:
Non-pleochroic

Chemical Properties of AlburniteHide

Formula:
Ag8GeTe2S4

Crystallography of AlburniteHide

Crystal System:
Isometric
Cell Parameters:
a = 10.4(1) Å
Unit Cell V:
1,124.86 ų (Calculated from Unit Cell)
Comment:
F43m

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.004Å(67)
3.136Å(48)
3.002Å(100)
2.600Å(26)
2.123Å(33)
2.002Å(61)
1.838Å(76)
1.644Å(12)
Comments:
Calculated

Type Occurrence of AlburniteHide

General Appearance of Type Material:
rounded to sub-rounded grains, veinlets or irregular inclusions hosted mainly by tetrahedrite, hessite, and rhodochrosite.
Place of Conservation of Type Material:
Mineralogical Museum, Department of Geology, Faculty of Biology and Geology, Babes-Bolyai University, Cluj-Napoca, Romania, registration numbers 71a/1 and 71a/2, and at Zentrale Elektronen-Mikrosonde, Institute of Geology, Mineralogy and Geophysics, Ruhr
Geological Setting of Type Material:
intermediate sulfidation gold-silver vein
Associated Minerals at Type Locality:

Synonyms of AlburniteHide

Relationship of Alburnite to other SpeciesHide

Other Members of this group:
ArgyroditeAg8GeS6Orth. mm2 : Pna21
CanfielditeAg8SnS6Orth. mm2
Putzite(Cu4.7Ag3.3)GeS6Iso. 4 3m : F4 3m
SpryiteAg8(As3+0.5As5+0.5)S6Orth. mm2 : Pna21

Related Minerals - Nickel-Strunz GroupingHide

2.BA.DzierżanowskiteCaCu2S2Trig. 3m (3 2/m) : P3m1
2.BA.05ChalcociteCu2SMon. 2/m : P21/b
2.BA.05DjurleiteCu31S16Mon. 2/m
2.BA.05GeeriteCu8S5Trig. 3
2.BA.05RoxbyiteCu9S5Tric. 1 : P1
2.BA.10AniliteCu7S4Orth. mmm (2/m 2/m 2/m) : Pnma
2.BA.10DigeniteCu9S5Trig. 3m (3 2/m) : R3m
2.BA.15BorniteCu5FeS4Orth. mmm (2/m 2/m 2/m) : Pbca
2.BA.20BellidoiteCu2SeTet. 4/m : P42/n
2.BA.20BerzelianiteCu2SeIso. m3m (4/m 3 2/m) : Fm3m
2.BA.25AthabascaiteCu5Se4Orth.
2.BA.25UmangiteCu3Se2Tet.
2.BA.30RickarditeCu7Te5Orth.
2.BA.30WeissiteCu2-xTeHex.
2.BA.35AcanthiteAg2SMon. 2/m : P21/m
2.BA.40MckinstryiteAg5-xCu3+xS4Orth. mmm (2/m 2/m 2/m) : Pnma
2.BA.40StromeyeriteAgCuSOrth. mmm (2/m 2/m 2/m)
2.BA.40dUM2003-13-S:AgAuCuAg6AuCu2S5
2.BA.45JalpaiteAg3CuS2Tet.
2.BA.45SelenojalpaiteAg3CuSe2Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
2.BA.50EucairiteAgCuSeOrth.
2.BA.55AguilariteAg4SeSMon. 2/m
2.BA.55NaumanniteAg2SeOrth. 2 2 2 : P21 21 21
2.BA.60CervelleiteAg4TeSMon. 2/m
2.BA.60HessiteAg2TeMon. 2/m : P21/b
2.BA.60ChenguodaiteAg9Fe3+Te2S4Orth.
2.BA.65Henryite(Cu,Ag)3+xTe2 , with x ~ 0.40 Iso. m3m (4/m 3 2/m) : Fd3c
2.BA.65StütziteAg5-xTe3, x = 0.24-0.36Hex. 6 : P6
2.BA.70ArgyroditeAg8GeS6Orth. mm2 : Pna21
2.BA.70CanfielditeAg8SnS6Orth. mm2
2.BA.70Putzite(Cu4.7Ag3.3)GeS6Iso. 4 3m : F4 3m
2.BA.75FischesseriteAg3AuSe2Iso. 4 3 2 : I41 3 2
2.BA.75Penzhinite(Ag,Cu)4Au(S,Se)4Hex.
2.BA.75PetrovskaiteAuAgSMon.
2.BA.75PetziteAg3AuTe2Iso. 4 3 2 : I41 3 2
2.BA.75UytenbogaardtiteAg3AuS2Trig. 3m (3 2/m) : R3c
2.BA.80Bezsmertnovite(Au,Ag)4Cu(Te,Pb)Orth.
2.BA.80BilibinskitePbCu2Au3Te2Iso.
2.BA.80Bogdanovite(Au,Te,Pb)3(Cu,Fe)Iso.

Fluorescence of AlburniteHide

Other InformationHide

Notes:
The mineral decomposes in intense 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 AlburniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Tămas, C.G., Grobety, B., Bailly, L., Bernhardt, H.-J. and Minut. A. (2013) Alburnite, IMA 2012-073. CNMNC Newsletter No. 15, February 2013, page 10; Mineralogical Magazine: 77: 1-12.
Tămaş, C. G., Grobety, B., Bailly, L., Bernhardt, H. J., & Minuţ, A. (2014) Alburnite, Ag8GeTe2S4, a new mineral species from the Roşia Montana Au-Ag epithermal deposit, Apuseni Mountains, Romania. American Mineralogist: 99(1): 57-64.

Internet Links for AlburniteHide

Localities for AlburniteHide

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.
Argentina
 
  • San Luis Province
    • Coronel Pringles Department
Gallard-Esquivel, M. C., Cepedal, A., Fuertes-Fuente, M., & Martin-Izard, A. (2018) Enrichment in critical metals (In-Ge) and Te-Se in epithermal deposits of the ‘La Carolina’district, San Luis, Argentina. Mineralogical Magazine, 82(S1), S61-S87.
Romania (TL)
 
  • Alba
    • Roşia Montanã Commune
      • Roşia Montană (Verespatak; Vöröspatak; Goldbach)
Tămaş, C. G., Grobety, B., Bailly, L., Bernhardt, H. J., & Minuţ, A. (2014). Alburnite, Ag8GeTe2S4, a new mineral species from the Roşia Montana Au-Ag epithermal deposit, Apuseni Mountains, Romania. American Mineralogist, 99(1), 57-64.
 
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