Ferroskutterudite
A valid IMA mineral species
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Formula:
(Fe,Co)As3
Colour:
Tin white
Lustre:
Metallic
Crystal System:
Isometric
Name:
Named in 2007 by Ernst M. Spiridonov, Yulia D. Gritsenko, and Inna Michailovna Kulikova for the ferroan analogue of skutterudite.
Unique Identifiers
Mindat ID:
30906
Long-form identifier:
mindat:1:1:30906:8
GUID
(UUID V4):
(UUID V4):
4917d716-94c3-4394-8b54-fe8bb8d12a6c
IMA Classification of Ferroskutterudite
Approved
IMA Formula:
FeAs3
Approval year:
2006
First published:
2007
Classification of Ferroskutterudite
2.EC.05
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
E : Metal Sulfides, M: S <= 1:2
C : M:S = 1:>2
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
E : Metal Sulfides, M: S <= 1:2
C : M:S = 1:>2
2.12.18.4
2 : SULFIDES
12 : AmBnXp, with (m+n):p = 1:2
2 : SULFIDES
12 : AmBnXp, with (m+n):p = 1:2
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 |
|---|---|---|
| Fskt | 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 Ferroskutterudite
Metallic
Transparency:
Opaque
Colour:
Tin white
Hardness:
VHN50=700 - 1050 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Perfect
Fracture:
Irregular/Uneven
Optical Data of Ferroskutterudite
Reflectivity:
| Wavelength | R |
|---|---|
| 400nm | 57.2% |
| 420nm | 57.6% |
| 440nm | 58.0% |
| 460nm | 58.2% |
| 480nm | 58.2% |
| 500nm | 58.0% |
| 520nm | 57.6% |
| 540nm | 57.3% |
| 560nm | 56.9% |
| 580nm | 56.4% |
| 600nm | 56.0% |
| 620nm | 55.5% |
| 640nm | 55.2% |
| 660nm | 54.7% |
| 680nm | 54.3% |
| 700nm | 53.8% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 58.2%.
Colour in reflected light:
White, pinkish creamy
Comments:
It is characterized by high relief, which is close to that of skutterudite and safflorite but higher than that of nickelskutterudite.
Chemistry of Ferroskutterudite
Mindat Formula:
(Fe,Co)As3
Elements listed:
Crystallography of Ferroskutterudite
Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Im3m
Cell Parameters:
a = 8.17(1) Å
Unit Cell V:
545.34 ų
Z:
8
Comment:
Its space group differs from that of other skutterudite-group minerals (Im3).
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.8 Å | (30) |
| 3.34 Å | (40) |
| 2.585 Å | (100) |
| 2.182 Å | (90) |
| 1.928 Å | (40) |
| 1.829 Å | (70) |
| 1.667 Å | (50) |
| 1.602 Å | (70) |
| 1.402 Å | (60) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-𝑇 alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) | |
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 36 : Carbonatites, kimberlites, and related igneous rocks | |
| Stage 5: Initiation of plate tectonics | <3.5-2.5 |
| 38 : Ophiolites |
Type Occurrence of Ferroskutterudite
General Appearance of Type Material:
Grains up to 0.1 mm in size.
Place of Conservation of Type Material:
Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia (no. 3440/1).
Geological Setting of Type Material:
In dolomite-calcite veins.
Associated Minerals at Type Locality:
Reference:
Spiridonov, E.M., Gritsenko, Yu.D., Kulikova, I.M. (2007): Ferroskutterudite (Fe,Co)As3: A new mineral species from the dolomite–calcite Veins of the Noril’sk Ore Field. Doklady Akademii Nauk 417, 242-244
Synonyms of Ferroskutterudite
Other Language Names for Ferroskutterudite
Simplified Chinese:铁方钴矿
Relationship of Ferroskutterudite to other Species
Other Members of this group:
| Kieftite | CoSb3 | Iso. m3 (2/m 3) : Im3 |
| Nickelskutterudite | (Ni,Co,Fe)As3 | Iso. m3 (2/m 3) : Im3 |
| Skutterudite | CoAs3 | Iso. m3 (2/m 3) : Im3 |
Common Associates
Associated Minerals Based on Photo Data:
| 1 photo of Ferroskutterudite associated with Grimmite | NiCo2S4 |
| 1 photo of Ferroskutterudite associated with Skutterudite | CoAs3 |
Related Minerals - Strunz-mindat Grouping
| 2.EC.05 | Kieftite | CoSb3 |
| 2.EC.05 | Nickelskutterudite | (Ni,Co,Fe)As3 |
| 2.EC.05 | Skutterudite | CoAs3 |
| 2.EC.10 | Patrónite | VS4 |
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 Ferroskutterudite
mindat.org URL:
https://www.mindat.org/min-30906.html
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References for Ferroskutterudite
Localities for Ferroskutterudite
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Czech Republic | |
| Škácha et al. (2021) |
France | |
| Harlaux et al. (2015, August) |
Germany | |
| Staude et al. (2012) |
Italy | |
| Caboni et al. (2018) |
Russia (TL) | |
| Spiridonov et al. (2007) |
Slovakia | |
| Kiefer et al. (2017) |
UK | |
| Solferino et al. (2021) |
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