Octahedrite (IVA, Of)
Find 1863, 41 kg

A large iron-rich mass found in a quarry 5 meters below the surface was eventually recognized as meteoritic. Indeed, the weathered Widmanstätten signature of its octahedral structure had been somewhat amplified by preferential weathering which left prominent taenite features in some regions. Previously partially or completely remelted troilite occurs in nodules. Schreibersite appears to be sparse. Buchwald (1975) did not observe schreibersite, but Cohen and, much later, Ramdohr (1973) recorded its presence.

The 79 IVA irons listed at The Meteoritical Society's 'Meteoritical Database' represent ~7% of all recovered irons. Almost all of the Obernkirchen mass was acquired by the British Museum in London.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

ⓘ Daubréelite

5 valid minerals.

Meteorite/Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

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Alphabetical List Tree Diagram

ⓘ IVA iron meteorite

Detailed Mineral List:

ⓘ Daubréelite

Formula: Fe²⁺Cr³⁺₂S₄

Description: As lamellae in troilite

References:

Ramdohr, Paul (1972) The Opaque Minerals in Stony Meteorites. De Gruyter. doi:10.1515/9783112651025

Buchwald, Vagn F. (1975) Handbook of Iron Meteorites - Their History, Distribution, Composition and Structure. University of California Press.

ⓘ Native Iron

Formula: Fe

Description: Pre-terrestrial annealing has removed some Neumann bands

References:

Ramdohr, Paul (1972) The Opaque Minerals in Stony Meteorites. De Gruyter. doi:10.1515/9783112651025

Buchwald, Vagn F. (1975) Handbook of Iron Meteorites - Their History, Distribution, Composition and Structure. University of California Press.

ⓘ Native Iron var. Kamacite

Formula: (Fe,Ni)

Description: Pre-terrestrial annealing has removed some Neumann bands

References:

Ramdohr, Paul (1972) The Opaque Minerals in Stony Meteorites. De Gruyter. doi:10.1515/9783112651025

Buchwald, Vagn F. (1975) Handbook of Iron Meteorites - Their History, Distribution, Composition and Structure. University of California Press.

ⓘ 'Plessite'

References:

Buchwald, Vagn F. (1975) Handbook of Iron Meteorites - Their History, Distribution, Composition and Structure. University of California Press.

ⓘ Schreibersite

Formula: (Fe,Ni)₃P

References:

Ramdohr, Paul (1972) The Opaque Minerals in Stony Meteorites. De Gruyter. doi:10.1515/9783112651025

ⓘ Taenite

Formula: (Fe,Ni)

Description: Somewhat more resistant to terrestrial weathering than some phases which have often been largely removed.

References:

Ramdohr, Paul (1972) The Opaque Minerals in Stony Meteorites. De Gruyter. doi:10.1515/9783112651025

Buchwald, Vagn F. (1975) Handbook of Iron Meteorites - Their History, Distribution, Composition and Structure. University of California Press.

ⓘ Troilite

Formula: FeS

References:

Ramdohr, Paul (1972) The Opaque Minerals in Stony Meteorites. De Gruyter. doi:10.1515/9783112651025

Buchwald, Vagn F. (1975) Handbook of Iron Meteorites - Their History, Distribution, Composition and Structure. University of California Press.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘ	Native Iron	1.AE.05	Fe
ⓘ	var. Kamacite	1.AE.05	(Fe,Ni)
ⓘ	Taenite	1.AE.10	(Fe,Ni)
ⓘ	Schreibersite	1.BD.05	(Fe,Ni)₃P
Group 2 - Sulphides and Sulfosalts
ⓘ	Troilite	2.CC.10	FeS
ⓘ	Daubréelite	2.DA.05	Fe²⁺Cr³⁺₂S₄
Unclassified
ⓘ	'Plessite'	-

List of minerals for each chemical element

P	Phosphorus
P	ⓘ Schreibersite	(Fe,Ni)₃P
S	Sulfur
S	ⓘ Daubréelite	Fe²⁺Cr₂³⁺S₄
S	ⓘ Troilite	FeS
Cr	Chromium
Cr	ⓘ Daubréelite	Fe²⁺Cr₂³⁺S₄
Fe	Iron
Fe	ⓘ Daubréelite	Fe²⁺Cr₂³⁺S₄
Fe	ⓘ Native Iron	Fe
Fe	ⓘ Native Iron var. Kamacite	(Fe,Ni)
Fe	ⓘ Schreibersite	(Fe,Ni)₃P
Fe	ⓘ Taenite	(Fe,Ni)
Fe	ⓘ Troilite	FeS
Ni	Nickel
Ni	ⓘ Native Iron var. Kamacite	(Fe,Ni)
Ni	ⓘ Schreibersite	(Fe,Ni)₃P
Ni	ⓘ Taenite	(Fe,Ni)

Other Regions, Features and Areas containing this locality

Eurasian PlateTectonic Plate

AvaloniaVolcanic Arc

EuropeContinent

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

www.lpi.usra.edu (n.d.) http://www.lpi.usra.edu/meteor/metbull.php?sea=&sfor=names&ants=&falls=&valids=&stype=contains&lrec=50&map=ge&browse=&country=Germany&srt=name&categ=Iron+meteorites&mblist=All&rect=&phot=&snew=0&pnt=Normal%20table&code=17976

www.encyclopedia-of-meteorites.com (n.d.) http://www.encyclopedia-of-meteorites.com/test/Obernkirchen_don_edwards.jpg

evols.library.manoa.hawaii.edu (n.d.) http://evols.library.manoa.hawaii.edu/bitstream/handle/10524/35868/vol3-NorthP-Okah(LO)pdf#page=4

Prior, G. T. (1923) Catalogue of Meteorites - With Special Reference to those Represented in the Collection of the British Museum (Natural History) (1st ed.) The Trustees of the British Museum, London.

Ramdohr, Paul (1972) The Opaque Minerals in Stony Meteorites. De Gruyter. doi:10.1515/9783112651025

Buchwald, Vagn F. (1975) Handbook of Iron Meteorites - Their History, Distribution, Composition and Structure. University of California Press.

Grady, Monica (2000) Catalogue of Meteorites (5th ed.). Cambridge University Press.

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