Log In
Ferchromide
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Ferchromide
Formula:
Cr3Fe1-x
Colour:
Light gray
Lustre:
Metallic
Hardness:
6½
Specific Gravity:
6.18 (Calculated)
Crystal System:
Isometric
Name:
For the chemical composition
Possibly an analogue of chromferide. Compare chemically similar 'UM1981-05-E:CrFe' and 'UM1981-06-E:CrFeNiSi'.
Unique Identifiers
Mindat ID:
1477
Long-form identifier:
mindat:1:1:1477:5
Similar Names
| Ferrichromite | A variety of Chromite | Fe2+(Cr3+,Fe3+)2O4 |
| Ferrochromite | A synonym of Chromite |
IMA Classification of Ferchromide
Approved
IMA Formula:
Cr1.5Fe0.2
Approval year:
1984
First published:
1986
Classification of Ferchromide
1.AE.15
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
A : Metals and Intermetallic Alloys
E : Iron-chromium family
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
A : Metals and Intermetallic Alloys
E : Iron-chromium family
Dana 7th ed.:
1.1.16.2
1.1.12.3
1 : NATIVE ELEMENTS AND ALLOYS
1 : Metals, other than the Platinum Group
1 : NATIVE ELEMENTS AND ALLOYS
1 : Metals, other than the Platinum Group
1.59
1 : Elements and Alloys (including the arsenides, antimonides and bismuthides of Cu, Ag and Au)
1 : Elements and Alloys (including the arsenides, antimonides and bismuthides of Cu, Ag and Au)
Mineral Symbols
As of 2021 there are now IMAâCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Fcr | IMAâCNMNC | Warr, L.N. (2021). IMAâCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Ferchromide
Metallic
Transparency:
Opaque
Colour:
Light gray
Hardness:
6½ on Mohs scale
Hardness:
VHN100=900 kg/mm2 - Vickers
Density:
6.18 g/cm3 (Calculated)
Optical Data of Ferchromide
Reflectivity:
| Wavelength | R1 (%) |
|---|---|
| 440nm | 55.2% |
| 480nm | 56.2% |
| 520nm | 58.0% |
| 560nm | 59.5% |
| 600nm | 61.0% |
| 640nm | 61.8% |
| 680nm | 62.8% |
| 720nm | 63.8% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 63.8%.
Chemistry of Ferchromide
Mindat Formula:
Cr3Fe1-x
Elements listed:
Crystallography of Ferchromide
Crystal System:
Isometric
Class (H-M):
m3m(4/m32/m) - Hexoctahedral
Space Group:
Pm3m
Setting:
Pm3m
Cell Parameters:
a = 2.882(5) Å
Unit Cell V:
23.94 Ă
Âł (Calculated from Unit Cell)
Z:
1
Morphology:
Small grains forming several hundred micron aggregates.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.04 Ă | (100) |
| 1.17 Ă | (90) |
| 0.77 Ă | (80) |
| 1.02 Ă | (70) |
| 1.44 Ă | (60) |
| 1.66 Ă | (50) |
| 1.29 Ă | (50) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 26 : Hadean detrital minerals |
Type Occurrence of Ferchromide
Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia
Geological Setting of Type Material:
Quartz veins in brecciated amphibolites and schist.
Associated Minerals at Type Locality:
Synonyms of Ferchromide
Other Language Names for Ferchromide
Common Associates
Associations Based on Photo Data:
| 3 photos of Ferchromide associated with Chromferide | Fe3Cr1-x (x = 0.6) |
Related Minerals - Strunz-mindat Grouping
| 1.AE. | Native Vanadium | V |
| 1.AE.05 | Native Chromium | Cr |
| 1.AE.05 | Hexamolybdenum | (Mo,Ru,Fe,Ir,Os) |
| 1.AE.05 | Native Tungsten | W |
| 1.AE.05 | 'Native Molybdenum' | Mo |
| 1.AE.05 | 'UM2001-06-E:CrFeNi' | Fe7Cr2Ni |
| 1.AE.05 | Native Iron | Fe |
| 1.AE.10 | Taenite | (Ni,Fe) |
| 1.AE.10 | Tetrataenite | FeNi |
| 1.AE.10 | 'Antitaenite' | Fe3Ni |
| 1.AE.15 | Chromferide | Fe3Cr1-x (x = 0.6) |
| 1.AE.15 | Wairauite | CoFe |
| 1.AE.20 | Awaruite | Ni3Fe |
| 1.AE.25 | Jedwabite | Fe7(Ta,Nb)3 |
| 1.AE.30 | 'Native Manganese' | Mn |
| 1.AE.35 | Nisnite | Ni3Sn |
Other Information
Magnetism:
Ferromagnetic
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 Ferchromide
mindat.org URL:
https://www.mindat.org/min-1477.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Ferchromide
Localities for Ferchromide
Showing 5 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
â - 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.
France | |
| Ducluzaux (2022) |
| Ducluzaux (2022) |
Russia (TL) | |
| Novgorodova et al. (1986) +1 other reference |
| Excalibur Mineral Company specimen |
| Victor V. Sharygin analytical data |
Quick NavTopAbout FerchromideUnique IdentifiersSimilar NamesIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Kumak ore field, Yasnensky District, Orenburg Oblast, Russia