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Fetiasite

Big Photo

Lercheltini (Lärcheltini) area, Binn Valley, Wallis (Valais), Switzerland
© Stephan Wolfsried

Show Fetiasite Photos (8)
Formula:
(Fe
3+
 
,Fe
2+
 
,Ti)
 
3
[O
 
2
|As
 
2
O
 
5
]
System:MonoclinicColour:Brown to black
Lustre:Hardness:5
Name:The name reflects its chemical composition: Iron (Fe), Titanium (Ti) and Arsenic (As)
This page provides mineralogical data about Fetiasite.

Classification of Fetiasite

IMA status:Approved
Strunz 8th edition ID:4/J.06-10
Nickel-Strunz 10th (pending) edition ID:4.JB.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
B : Arsenites, antimonites, bismuthites; with additional anions, without H2O
Dana 8th edition ID:45.1.13.1

45 : ACID AND NORMAL ANTIMONITES AND ARSENITES
1 : Miscellaneous
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Type Occurrence of Fetiasite

Co-type Localities:Mount Cervandone, Devero Alp (Devero Valley; Val Devero), Baceno, Ossola Valley, Verbano-Cusio-Ossola Province, Piedmont, Italy
Gorb, Lercheltini (Lärcheltini) area, Binn Valley, Wallis (Valais), Switzerland
Year of Discovery:1994

Physical Properties of Fetiasite

Colour:Brown to black
Streak:Light brown to ochre
Hardness (Mohs):5

Crystallography of Fetiasite

Crystal System:Monoclinic
Cell Parameters:a = 10.61Å, b = 3.25Å, c = 8.94Å
β = 108.95°
Ratio:a:b:c = 3.265 : 1 : 2.751
Unit Cell Volume:V 291.57 ų (Calculated from Unit Cell)

Chemical Properties of Fetiasite

Formula:
(Fe
3+
 
,Fe
2+
 
,Ti)
 
3
[O
 
2
|As
 
2
O
 
5
]
Essential elements:As, Fe, O
All elements listed in formula:As, Fe, O, Ti
Common Impurities:Mn

Relationship of Fetiasite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.JB.10Manganarsite
Mn
 
3
[(OH)
 
4
|As
 
2
O
 
4
]
4.JB.15Magnussonite
Mn
 
10
As
 
6
O
 
18
(OH,Cl)
 
2
4.JB.15UM1984-09-AsO:ClHMn
Mn
 
10
As
 
6
O
 
18
(OH)Cl
4.JB.20Armangite
Mn
2+
26
[CO
 
3
|(HAsO
 
3
)
 
4
|(AsO
 
3
)
 
14
]
4.JB.25Nanlingite
NaCa
 
6
(Mg,Fe,Li)
 
12
(AsO
 
3
)
 
2
[Fe(AsO
 
3
)
 
6
]F
 
14
·
4.JB.30Asbecasite
Ca
 
3
(Ti,Sn
4+
 
)Be
 
2
[(AsO
 
3
)
 
3
|SiO
 
4
]
 
2
4.JB.35Stenhuggarite
CaFeSbO(AsO
 
3
)
 
2
4.JB.40Trigonite
Pb
 
3
Mn
2+
 
[HAsO
 
3
|(AsO
 
3
)
 
2
]
4.JB.45Finnemanite
Pb
 
5
[Cl|(AsO
 
3
)
 
3
]
4.JB.50Gebhardite
Pb
 
8
[O|Cl
 
6
|(As
 
2
O
 
5
)
 
2
]
4.JB.55Derbylite
(Fe,Fe,Ti)
 
7
SbO
 
13
(OH)
4.JB.55Tomichite
(V,Fe)
 
4
Ti
 
3
AsO
 
13
OH
4.JB.55Graeserite
(Fe
3+
 
,Ti)
 
4
Ti
 
3
AsO
 
13
(OH)
4.JB.60Hemloite
(As,Sb)
 
2
(Ti,V,Fe,Al)
 
12
O
 
23
(OH)
4.JB.65Freedite
Pb
 
15
(Cu,Fe
2+
 
)
 
3
[O
 
7
|Cl
 
10
|(AsO
 
3
)
 
4
]
4.JB.70Georgiadèsite
Pb
 
16
[(OH)
 
6
|Cl
 
14
|(AsO
 
4
)
 
4
]
4.JB.75Ekatite
(Fe
3+
 
,Fe
2+
 
,Zn)
 
12
(OH)
 
6
(AsO
 
3
)
 
6
[AsO
 
3
,HOSiO
 
3
]
 
2

Other Names for Fetiasite

Synonyms:
IMA1991-019
Other Languages:
German:Fetiasit
Russian:Фетиасит
Spanish:Fetiasita

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 Fetiasite

Reference List:American Mineralogist: 79: 996-1002.

New Minerals (1997), New Minerals 1990-1994.

Internet Links for Fetiasite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Fetiasite in the Natural History Museum (London) online catalogue
  • Fetiasite details from Handbook of Mineralogy (PDF)
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    Localities for Fetiasite

    (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.
    Italy
     
    • Piedmont
      • Verbano-Cusio-Ossola Province
        • Ossola Valley
          • Baceno
            • Devero Alp (Devero Valley; Val Devero)
    		American Mineralogist, Volume 79, pages 996-1002, 1994
    Switzerland
     
    • Wallis (Valais)
      • Binn Valley
        • Kriegalp Valley (Chriegalp Valley)
    		No reference listed
        • Lercheltini (Lärcheltini) area
    		Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 164-165.; American Mineralogist, Volume 79, pages 996-1002, 1994
    Mineral and/or Locality
    Google
     
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