Chromferide
A valid IMA mineral species
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About Chromferide
Formula:
Fe3Cr1-x (x = 0.6)
Colour:
White, grey
Lustre:
Metallic
Hardness:
4
Specific Gravity:
6.69 (Calculated)
Crystal System:
Isometric
Name:
For the chemical composition.
Possibly an analogue of ferchromide. Compare chemically similar 'UM1981-05-E:CrFe' and 'UM1981-06-E:CrFeNiSi'.
Unique Identifiers
Mindat ID:
1035
Long-form identifier:
mindat:1:1:1035:7
Similar Names
| Chromferrit | A variety of Chromite |
| Chromoferrite | A synonym of Chromite |
IMA Classification of Chromferide
Classification of Chromferide
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.:
1.1.16.1
1.1.12.2
1 : NATIVE ELEMENTS AND ALLOYS
1 : Metals, other than the Platinum Group
1 : NATIVE ELEMENTS AND ALLOYS
1 : Metals, other than the Platinum Group
1.58
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 IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Cfe | 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 Chromferide
Metallic
Transparency:
Opaque
Colour:
White, grey
Hardness:
4 on Mohs scale
Hardness:
VHN100=260 kg/mm2 - Vickers
Density:
6.69 g/cm3 (Calculated)
Optical Data of Chromferide
Reflectivity:
| Wavelength | R1 (%) |
|---|---|
| 440nm | 50.4% |
| 480nm | 50.9% |
| 520nm | 53.0% |
| 560nm | 56.5% |
| 600nm | 57.9% |
| 640nm | 59.0% |
| 680nm | 60.7% |
| 700nm | 60.8% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 60.8%.
Chemistry of Chromferide
Mindat Formula:
Fe3Cr1-x (x = 0.6)
Elements listed:
Crystallography of Chromferide
Crystal System:
Isometric
Class (H-M):
m3m(4/m32/m) - Hexoctahedral
Space Group:
Pm3m
Setting:
Pm3m
Cell Parameters:
a = 2.8959(5) Å
Unit Cell V:
24.29 ų (Calculated from Unit Cell)
Morphology:
Small grains
Comment:
Z=0.5
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.02 Å | (100) |
| 1.16 Å | (100) |
| 1.43 Å | (80) |
| 1.01 Å | (70) |
| 1.28 Å | (50) |
| 2.87 Å | (20) |
| 1.656 Å | (10) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) | |
| Stage 5: Initiation of plate tectonics | <3.5-2.5 |
| 40 : Regional metamorphism (greenschist, amphibolite, granulite facies) |
Type Occurrence of Chromferide
Place of Conservation of Type Material:
Fersman museum
Geological Setting of Type Material:
Quartz veins
Synonyms of Chromferide
Other Language Names for Chromferide
Common Associates
Associations Based on Photo Data:
| 3 photos of Chromferide associated with Ferchromide | Cr3Fe1-x |
| 2 photos of Chromferide associated with 'Glass' | |
| 1 photo of Chromferide associated with Native Chromium | Cr |
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 | Wairauite | CoFe |
| 1.AE.15 | Ferchromide | Cr3Fe1-x |
| 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:
Diamagnetic
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 Chromferide
mindat.org URL:
https://www.mindat.org/min-1035.html
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External Links:
Mineral Dealers:
References for Chromferide
Localities for Chromferide
Showing 14 localities.
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.
Belarus | |
| Levitskiy et al. (2018, July) |
China | |
| Khanchuk et al. (2017, March) |
| norman king specimen |
France | |
| Ducluzaux (2022) |
| Ducluzaux (2022) |
Kazakhstan | |
| doi.org (n.d.) +1 other reference |
Russia | |
| Gurov et al. (2019) |
| Novgorodova et al. (1986) +1 other reference |
| Pavlushin et al. (2025) |
| Erokhin et al. (2014) |
| Попов et al. (2018) |
Syria | |
| Moore et al. (2020) |
USA | |
| Hower et al. (2018) |
The Moon | |
| Tatyana A. Gornostaeva analytical data |
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