Fetiasite
A valid IMA mineral species
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About Fetiasite
Formula:
(Fe3+,Fe2+,Ti)3(As2O5)O2
Colour:
Brown to black
Lustre:
Metallic, Sub-Metallic
Hardness:
5
Specific Gravity:
4.6
Crystal System:
Monoclinic
Name:
The name reflects its chemical composition: Iron (Fe), Titanium (Ti) and Arsenic (As).
This page provides mineralogical data about Fetiasite.
Unique Identifiers
Mindat ID:
1542
Long-form identifier:
mindat:1:1:1542:0
GUID
(UUID V4):
(UUID V4):
56dcca9c-fb40-438e-8d50-0c510fe970a8
IMA Classification of Fetiasite
Approved
IMA Formula:
(Fe2+,Fe3+,Ti4+)3O2As3+2O5
First published:
1994
Classification of Fetiasite
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
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
45 : ACID AND NORMAL ANTIMONITES AND ARSENITES
1 : Miscellaneous
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Fet | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Fetiasite
Metallic, Sub-Metallic
Transparency:
Opaque
Colour:
Brown to black
Comment:
red-brown when altered;
Streak:
Light brown to ochre
Hardness:
5 on Mohs scale
Hardness:
VHN50=440 - 490 kg/mm2 - Vickers
Hardness Data:
Measured
Cleavage:
Perfect
On {100}
On {100}
Fracture:
Irregular/Uneven, Conchoidal
Density:
4.6 g/cm3 (Measured) 4.77(3) g/cm3 (Calculated)
Optical Data of Fetiasite
Anisotropism:
Visible along grain boundaries
Reflectivity:
Wavelength | R1 | R2 |
---|---|---|
470nm | 15.4% | 16.0% |
546nm | 15.3% | 15.8% |
589nm | 14.8% | 15.2% |
650nm | 14.2% | 15.0% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 16.0%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Creamy white
Chemistry of Fetiasite
Mindat Formula:
(Fe3+,Fe2+,Ti)3(As2O5)O2
Elements listed:
Common Impurities:
Mn
Crystallography of Fetiasite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Setting:
P21/m
Cell Parameters:
a = 10.61 Å, b = 3.25 Å, c = 8.94 Å
β = 108.95°
β = 108.95°
Ratio:
a:b:c = 3.265 : 1 : 2.751
Unit Cell V:
291.57 ų (Calculated from Unit Cell)
Z:
2
Morphology:
a {100}, c {001}, m {01l}.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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CIF File Best | x | y | z | a | b | c
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0001675 | Fetiasite | Graeser S, Schwander H, Demartin F, Gramaccioli C M, Pilati T, Reusser E (1994) Fetiasite (Fe2+,Fe3+,Ti)3O2[As2O5], a new arsenite mineral: Its description and structure determination American Mineralogist 79 996-1002 | 1994 | Lengenbach quarry, Binnatal, Switzerland | 0 | 293 | |
0001676 | Fetiasite | Graeser S, Schwander H, Demartin F, Gramaccioli C M, Pilati T, Reusser E (1994) Fetiasite (Fe2+,Fe3+,Ti)3O2[As2O5], a new arsenite mineral: Its description and structure determination American Mineralogist 79 996-1002 | 1994 | Cervandone | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.749 Å | (100) |
2.811 Å | (94) |
2.391 Å | (85) |
2.985 Å | (67) |
1.779 Å | (48) |
1.709 Å | (35) |
1.754 Å | (32) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
46 : Near-surface hydrothermal alteration of minerals (see also #22) |
Type Occurrence of Fetiasite
Co-Type Localities:
General Appearance of Type Material:
Crystals are covered by a thin brown-red alteration layer that renders the mineral difficult to recognize. Minute tabular crystals about 0.2 mm in diameter, forming globular aggregates of pine-cone shape, rarely exceeding 2 mm. Radial aggregates (up to 40
Place of Conservation of Type Material:
1) Department of Mineralogy, Natural History Museum, Basel, Switzerland.
2) The Mineralogical Institute, University of Basel, Switzerland.
2) The Mineralogical Institute, University of Basel, Switzerland.
Geological Setting of Type Material:
Formed from As-bearing solutions remobilized from pre-Alpine ore concentrations by Alpine metamorphism.
Associated Minerals at Type Locality:
Reference:
Graeser, S., Schwander, H., Demartin, F., Gramaccioli, C.M., Pilati, T., Reusser, E. (1994) Fetiasite (Fe2+, Fe3+, Ti)3O2[As2O5], a new arsenite mineral: its description and structure determination. American Mineralogist: 79: 996-1002.
Synonyms of Fetiasite
Other Language Names for Fetiasite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
4.JB. | Cuyaite | Ca2Mn3+As3+14O24Cl |
4.JB. | Brattforsite | Mn19(AsO 3)12Cl2 |
4.JB.10 | Manganarsite | Mn3(As2O4)(OH)4 |
4.JB.15 | Magnussonite | Mn2+10(As3+O3)6(OH,Cl)2 |
4.JB.15 | UM1984-09-AsO:ClHMn | Mn10As6O18(OH)Cl |
4.JB.20 | Armangite | Mn2+26(AsO3)14(HAsO3)4(CO3) |
4.JB.25 | Nanlingite | Na(Ca5Li)Mg12(AsO3)2[Fe(AsO3)6]F14 |
4.JB.30 | Asbecasite | Ca3(Ti,Sn4+)Be2(AsO3)6(SiO4)2 |
4.JB.35 | Stenhuggarite | CaFeSb(AsO3)2O |
4.JB.40 | Trigonite | Pb3Mn2+(AsO3)2(HAsO3) |
4.JB.45 | Finnemanite | Pb5(AsO3)3Cl |
4.JB.50 | Gebhardite | Pb8(As2O5)2OCl6 |
4.JB.55 | Derbylite | Fe3+4Ti3Sb3+O13(OH) |
4.JB.55 | Tomichite | (V,Fe)4Ti3AsO13(OH) |
4.JB.55 | Graeserite | Fe3+4Ti3As3+O13(OH) |
4.JB.60 | Hemloite | (Ti,V3+,Fe3+,Al)12(As3+,Sb3+)2O23(OH) |
4.JB.65 | Freedite | Cu+Pb8(AsO3)2O3Cl5 |
4.JB.70 | Georgiadesite | Pb4(As3+O3)Cl4(OH) |
4.JB.75 | Ekatite | (Fe3+,Fe2+,Zn)12(AsO3)6(AsO3,HSiO4)2(OH)6 |
4.JB.75 | Szklaryite | ◻Al6BAs3+3O15 |
4.JB.85 | Lepageite | Mn2+3(Fe3+7Fe2+4)O3[Sb3+5As3+8O34] |
4.JB.90 | Bianchiniite | Ba2(TiV)(As2O5)2OF |
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.
Internet Links for Fetiasite
mindat.org URL:
https://www.mindat.org/min-1542.html
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Please feel free to link to this page.
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References for Fetiasite
Reference List:
Localities for Fetiasite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Australia | |
| |
Italy (TL) | |
| |
Switzerland (TL) | |
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Gorb, Lärchultini, Binn, Goms, Valais, Switzerland