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Fetiasite

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

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Formula:
(Fe
3+
 
,Fe
2+
 
,Ti)
 
3
(As
 
2
O
 
5
)O
 
2
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
mindat.org URL:http://www.mindat.org/min-1542.html
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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
(As
 
2
O
 
5
)O
 
2
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
(As
 
2
O
 
4
)(OH)
 
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
(AsO
 
3
)
 
14
(HAsO
 
3
)
 
4
(CO
 
3
)
4.JB.25Nanlingite
NaMg
 
4
(AsO
 
3
)
 
2
F
 
4
4.JB.30Asbecasite
Ca
 
3
(Ti,Sn
4+
 
)Be
 
2
(AsO
 
3
)
 
6
(SiO
 
4
)
 
2
4.JB.35Stenhuggarite
CaFeSb(AsO
 
3
)
 
2
O
4.JB.40Trigonite
Pb
 
3
Mn
2+
 
(AsO
 
3
)
 
2
(HAsO
 
3
)
4.JB.45Finnemanite
Pb
 
5
(AsO
 
3
)
 
3
Cl
4.JB.50Gebhardite
Pb
 
8
(As
 
2
O
 
5
)
 
2
OCl
 
6
4.JB.55Derbylite
Fe
3+
4
Ti
 
3
Sb
3+
 
O
 
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
(Ti,V
3+
 
,Fe
3+
 
,Al)
 
12
(As
3+
 
,Sb
3+
 
)
 
2
O
 
23
(OH)
4.JB.65Freedite
Cu
+
 
Pb
 
8
(AsO
 
3
)
 
2
O
 
3
Cl
 
5
4.JB.70Georgiadèsite
Pb
 
4
(AsO
 
3
)Cl
 
4
(OH)
4.JB.75Ekatite
(Fe
3+
 
,Fe
2+
 
,Zn)
 
12
(AsO
 
3
)
 
6
(AsO
 
3
,HSiO
 
4
)
 
2
(OH)
 
6

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

Search Engines:
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    • External Links:
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  • Look for Fetiasite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Fetiasite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
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  • Fine Minerals from Weinrich Minerals, Inc.
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
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  • Fabre Minerals - search for Fetiasite specimens
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  • Find Fetiasite on www.crystalclassics.co.uk
  • Buy from David K Joyce minerals
  • SpiriferMinerals.com - high quality low prices
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    • Localities for Fetiasite

    Hide Locality List
    (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
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 21st Jun 2011 16:01:07
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