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Fettelite

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About FetteliteHide

Formula:
[Ag6As2S7][Ag10HgAs2S8]
Colour:
Dark violet to scarlet
Lustre:
Adamantine, Metallic
Hardness:
Crystal System:
Monoclinic
Name:
Named in honor of Michael Fettel, a collector who contributed to the geology of the Odenwald, and who first collected the mineral.
Easy to confuse with polybasite.

Structurally related to the members of the Pearceite Group.


Classification of FetteliteHide

Approved
Approval Year:
1994
2.LA.30

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
L : Unclassified Sulfosalts
A : Without essential Pb
3.2.10.

3 : SULFOSALTS
2 : ø = 4

Physical Properties of FetteliteHide

Adamantine, Metallic
Transparency:
Opaque
Colour:
Dark violet to scarlet
Streak:
vermillion
Hardness:
3½ on Mohs scale
Hardness:
VHN20=122 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Perfect
{001}
Fracture:
Irregular/Uneven, Sub-Conchoidal

Optical Data of FetteliteHide

Type:
Anisotropic
Anisotropism:
weak
Bireflectance:
from white to brownish grey
Colour in reflected light:
greyish white
Internal Reflections:
red

Chemical Properties of FetteliteHide

Formula:
[Ag6As2S7][Ag10HgAs2S8]
Idealised Formula:
Ag16HgAs4S15

Crystallography of FetteliteHide

Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
B2
Setting:
C2
Cell Parameters:
a = 26.0388(10) Å, b = 15.0651(8) Å, c = 15.5361(8) Å
β = 90.48(1)°
Ratio:
a:b:c = 1.728 : 1 : 1.031
Unit Cell V:
6094.2 ų
Z:
8
Morphology:
Platy.
Twinning:
Intimately twinned with six twin domains.
Comment:
Strong hexagonal pseudosymmetry (a = 15.00, c = 15.46 A).

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.175 Å(60)
3.091 Å(100)
2.998 Å(40)
2.755 Å(30)
1.878 Å(80)

Type Occurrence of FetteliteHide

Synonyms of FetteliteHide

Other Language Names for FetteliteHide

German:Fettelit
Simplified Chinese:弗硫砷汞银矿
Spanish:Fettelita

Relationship of Fettelite to other SpeciesHide

Structurally related to group(s):

Common AssociatesHide

Associated Minerals Based on Photo Data:
4 photos of Fettelite associated with ProustiteAg3AsS3
4 photos of Fettelite associated with AcanthiteAg2S
1 photo of Fettelite associated with QuartzSiO2

Related Minerals - Nickel-Strunz GroupingHide

2.LA.10DervilliteAg2AsS2Mon. 2/m : P2/b
2.LA.15DaomaniteCuPtAsS2Orth.
2.LA.20VaughaniteTlHgSb4S7Tric.
2.LA.25CriddleiteTlAg2Au3Sb10S10Mon.
2.LA.35Chaméanite(Cu,Fe)4As(Se,S)4Iso.
2.LA.40ArcubisiteAg6CuBiS4
2.LA.45MgriiteCu3AsSe3
2.LA.50Benleonardite[Ag6(Sb,As)2S6Te] [Ag9Cu(S,Te)2Te2]Trig. 3m (3 2/m) : P3m1
2.LA.55TsnigriiteAg9SbTe3S3Mon.
2.LA.60BorovskitePd3SbTe4Iso.
2.LA.65JonassoniteAuBi5S4Mon.

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 FetteliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Mineralogical Record: 28: 141.
Wang, N., Paniagua, A. (1996) Fettelite, a new Hg-sulfosalt mineral from Odenwald. Neues Jahrbuch für Mineralogie, Monatshefte (1996): 313-320.
(1997) American Minneralogist: 82: 621.
Bindi, L., Keutsch, F.N., Francis, C.A., Menchetti, S. (2009) Fettelite, [Ag6As2S7][Ag10HgAs2S8] from Chanarcillo, Chile: Crystal structure, pseudosymmetry, twinning, and revised chemical formula. American Mineralogist: 94: 609-615.
Bindi, L., Downs, R. T., Spry, P. G., Pinch, W. W., & Menchetti, S. (2012). A chemical and structural re-examination of fettelite samples from the type locality, Odenwald, southwest Germany. Mineralogical Magazine, 76(3), 551-566.

Internet Links for FetteliteHide

Localities for FetteliteHide

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.
Chile
 
  • Atacama
    • Copiapó Province
Bindi, L., Keutsch, F.N., Francis, C.A., Menchetti, S. (2009): Fettelite, [Ag6As2S7][Ag10HgAs2S8] from Chanarcillo, Chile: Crystal structure, pseudosymmetry, twinning, and revised chemical formula. American Mineralogist, 94, 609-615.
maurizio dini collection
Harvard University specimen
A. Moesta; "Chlor, Brom und Jodverbindungen des Silbers in der natur"; Facultat zu Marburg; Schnellpressendruck von C.L. Pfeil, Marburg, 1869
Germany (TL)
 
  • Odenwald
    • Mühltal
      • Nieder-Beerbach
Neues Jahrbuch Min. Monatschefte 1996, 313-320
Italy
 
  • Tuscany
    • Lucca Province
      • Pietrasanta
        • Valdicastello Carducci
Biagioni, C., Bindi, L., Orlandi, P., Michelucci, E., Bazzoni, C., Bernocchi, M. & Mangoni, G. (2014): Billingsleyite e fettelite. Nuovi ritrovamenti toscani. Rivista Mineralogica Italiana, 38(1), 26-31.
Morocco
 
  • Drâa-Tafilalet Region
    • Tinghir Province
      • Imiter District
Marcus Origlieri (PXRD analysis) (see also http://www.mindat.org/mesg-7-93085.html)
 
矿物 and/or 产地  
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