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Fetiasite

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Formula:
(Fe3+,Fe2+,Ti)3(As2O5)O2
System:
Monoclinic
Colour:
Brown to black
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

Approved
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
45.1.13.1

45 : ACID AND NORMAL ANTIMONITES AND ARSENITES
1 : Miscellaneous

Physical Properties of Fetiasite

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

Chemical Properties of Fetiasite

Formula:
(Fe3+,Fe2+,Ti)3(As2O5)O2
IMA Formula:
(Fe2+,Fe3+,Ti4+)3O2As23+O5
Elements listed in formula:
Common Impurities:
Mn

Crystallography of Fetiasite

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

Type Occurrence of Fetiasite

Relationship of Fetiasite to other Species

4.JB.10ManganarsiteMn3(As2O4)(OH)4
4.JB.15MagnussoniteMn10As6O18(OH,Cl)2
4.JB.15UM1984-09-AsO:ClHMnMn10As6O18(OH)Cl
4.JB.20ArmangiteMn262+(AsO3)14(HAsO3)4(CO3)
4.JB.25NanlingiteNa(Ca5Li)Mg12(AsO3)2[Fe(AsO3)6]F14
4.JB.30AsbecasiteCa3(Ti,Sn4+)Be2(AsO3)6(SiO4)2
4.JB.35StenhuggariteCaFeSb(AsO3)2O
4.JB.40TrigonitePb3Mn2+(AsO3)2(HAsO3)
4.JB.45FinnemanitePb5(AsO3)3Cl
4.JB.50GebharditePb8(As2O5)2OCl6
4.JB.55DerbyliteFe43+Ti3Sb3+O13(OH)
4.JB.55Tomichite(V,Fe)4Ti3AsO13(OH)
4.JB.55Graeserite(Fe3+,Ti)4Ti3AsO13(OH)
4.JB.60Hemloite(Ti,V3+,Fe3+,Al)12(As3+,Sb3+)2O23(OH)
4.JB.65FreediteCu+Pb8(AsO3)2O3Cl5
4.JB.70GeorgiadèsitePb4(AsO3)Cl4(OH)
4.JB.75Ekatite(Fe3+,Fe2+,Zn)12(AsO3)6(AsO3,HSiO4)2(OH)6

Other Names for Fetiasite

Name in Other Languages:
German:Fetiasit
Spanish:Fetiasita

Other Information

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 Fetiasite

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

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

Internet Links for Fetiasite

mindat.org URL:
https://www.mindat.org/min-1542.html
Please feel free to link to this page.

Localities for Fetiasite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Australia
 
  • New South Wales
    • Kennedy Co.
      • Condobolin district
        • Mineral Hill field
McKinnon, A., 2013 Recent Developments at the Mineral Hill mine, NSW. Abstracts, 36th Annual Seminar, Mineralogical Societies of Australasia. Sydney. p. 21-23.
Italy (TL)
 
  • Piedmont
    • Verbano-Cusio-Ossola Province
      • Ossola Valley
        • Antigorio Valley
          • Devero Valley
            • Baceno
              • Devero Alp
American Mineralogist, Volume 79, pages 996-1002, 1994
Switzerland
 
  • Wallis (Valais)
    • Binn Valley
      • Kriegalp Valley (Chriegalp Valley)
No reference listed
      • Lercheltini area (Lärcheltini)
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  
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