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Fettelite

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Glasberg quarry, Nieder-Beerbach, Mühltal, Odenwald, Hesse, Germany
© Stephan Wolfsried

Show Fettelite Photos (18)



Formula:
[Ag
 
6
As
 
2
S
 
7
][Ag
 
10
HgAs
 
2
S
 
8
]
System:TrigonalColour:Dark violet to scarlet
Lustre:Adamantine, MetallicHardness:4
Name:Named for M. Fettel, a collector who first observed it.


Easy to confuse with polybasite.

Classification of Fettelite

IMA status:Approved 1994
Strunz 8th edition ID:2/E.06-40
Nickel-Strunz 10th (pending) edition ID:2.LA.30

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
L : Unclassified Sulfosalts
A : Without essential Pb
Dana 8th edition ID:3.2.10.

3 : SULFOSALTS
2 : ø = 4
mindat.org URL:http://www.mindat.org/min-1543.html
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Type Occurrence of Fettelite

Type Locality:Glasberg quarry, Nieder-Beerbach, Mühltal, Odenwald, Hesse, Germany

Physical Properties of Fettelite

Lustre:Adamantine, Metallic
Colour:Dark violet to scarlet
Streak:vermillion
Hardness (Mohs):4

Crystallography of Fettelite

Crystal System:Trigonal
Cell Parameters:a = 15.00Å, c = 15.46Å
β = (1)°
Ratio:a:c = 1 : 1.031
Unit Cell Volume:V 3,012.47 ų (Calculated from Unit Cell)
Morphology:Platy
Twinning:Intimately twinned with six twin domains.
Comment:Strong hexagonal pseudosymmetry.
X-Ray Powder Diffraction:
d-spacingIntensity
3.175 (60)
3.091 (100)
2.998 (40)
2.755 (30)
1.878 (80)

Chemical Properties of Fettelite

Formula:
[Ag
 
6
As
 
2
S
 
7
][Ag
 
10
HgAs
 
2
S
 
8
]
Idealised Formula:
Ag
 
16
HgAs
 
4
S
 
15
Essential elements:Ag, As, Hg, S
All elements listed in formula:Ag, As, Hg, S

Relationship of Fettelite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
2.LA.10Dervillite
Ag
 
2
AsS
 
2
2.LA.15Daomanite
CuPtAsS
 
2
2.LA.20Vaughanite
TlHgSb
 
4
S
 
7
2.LA.25Criddleite
TlAg
 
2
Au
 
3
Sb
 
10
S
 
10
2.LA.35Chaméanite
(Cu,Fe)
 
4
As(Se,S)
 
4
2.LA.40Arcubisite
Ag
 
6
CuBiS
 
4
2.LA.45Mgriite
Cu
 
3
AsSe
 
3
2.LA.50Benleonardite
Ag
 
8
(Sb,As)Te
 
2
S
 
3
2.LA.55Tsnigriite
Ag
 
9
SbTe
 
3
(S,Se)
 
3
2.LA.60Borovskite
Pd
 
3
SbTe
 
4
2.LA.65Jonassonite
AuBi
 
5
S
 
4

Other Names for Fettelite

Synonyms:
IMA1994-056Sanguinite
Other Languages:
German:Fettelit
Simplified Chinese:弗硫砷汞银矿
Spanish:Fettelita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Fettelite

Reference List:

- +
American Mineralogist, Volume 94, pages 609–615, 2009

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. [English abstract: Am. Min. 82 (1997) 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.

Internet Links for Fettelite

Search Engines:
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    • External Links:
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  • Look for Fettelite on Wikipedia
  • Look for Fettelite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Fettelite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
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  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
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    • Localities for Fettelite

    The 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.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Chile
     
    • Atacama Region
      • 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
     
    • Hesse
      • Odenwald
        • Mühltal
          • Nieder-Beerbach
    		Neues Jahrbuch Min. Monatschefte 1996, 313-320
    Morocco
     
    • Souss-Massa-Draâ Region
      • Ouarzazate Province
        • Djebel Saghro (Jbel Saghro)
          • Imiter District
    		Marcus Origlieri (PXRD analysis) (see also http://www.mindat.org/mesg-7-93085.html)
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