Unnamed (Iron Carbide)
A material that is NOT an approved mineral species
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Formula:
Fe7C3
Crystal System:
Orthorhombic
Compare other Fe carbides: cohenite and haxonite.
The composition fits that of the so-called 'chalypite'.
Forms lamellae, 100-500 nm in size, within inclusions in lower-mantle diamond. The lamellae cut 'Unnamed (Iron Carbonitride)'.
Co-described with associated 'Unnamed (Iron Nitride I)', 'Unnamed (Iron Nitride II)', silicon carbide (possibly moissanite), Mn-rich xieite, and other oxide(s). Other, earlier phases coexisting, are nyerereite, nahcolite, calcite, wüstite, and periclase.
The phase is among a solid solution(s) thay may be described as M5(C,N)3 - M23(C,N)6, with M/(C,N) ratio in the 1.65 to 3.98 range.
Likely formed due to infiltration of liquid metal (with some lighter elements), coming from the outer core to the D" layer.
The composition fits that of the so-called 'chalypite'.
Forms lamellae, 100-500 nm in size, within inclusions in lower-mantle diamond. The lamellae cut 'Unnamed (Iron Carbonitride)'.
Co-described with associated 'Unnamed (Iron Nitride I)', 'Unnamed (Iron Nitride II)', silicon carbide (possibly moissanite), Mn-rich xieite, and other oxide(s). Other, earlier phases coexisting, are nyerereite, nahcolite, calcite, wüstite, and periclase.
The phase is among a solid solution(s) thay may be described as M5(C,N)3 - M23(C,N)6, with M/(C,N) ratio in the 1.65 to 3.98 range.
Likely formed due to infiltration of liquid metal (with some lighter elements), coming from the outer core to the D" layer.
Unique Identifiers
Mindat ID:
51709
Long-form identifier:
mindat:1:1:51709:2
GUID
(UUID V4):
(UUID V4):
af36ee86-05f3-45a8-80ad-b4f3c68f88b8
Chemical Properties of Unnamed (Iron Carbide)
Formula:
Fe7C3
Elements listed:
Crystallography of Unnamed (Iron Carbide)
Crystal System:
Orthorhombic
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 Unnamed (Iron Carbide)
mindat.org URL:
https://www.mindat.org/min-51709.html
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References for Unnamed (Iron Carbide)
Reference List:
Localities for Unnamed (Iron Carbide)
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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.
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