N'Goureyma meteorite, Djenné Cercle, Mopti Region, Malii
Regional Level Types | |
---|---|
N'Goureyma meteorite | Meteorite Fall Location |
Djenné Cercle | Cercle |
Mopti Region | Region |
Mali | Country |
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Latitude & Longitude (WGS84):
13° 50' 59'' North , 4° 22' 59'' West
Latitude & Longitude (decimal):
Locality type:
Meteorite Class:
Meteoritical Society Class:
Köppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Djénné | 22,382 (2007) | 19.4km |
N'Goureyma, Anomalous Iron (I-ung).
Fall, 15 June 1900; 37.5 kg
The N'Goureyma iron meteorite (~9.4 % Ni) was observed to fall and was afterwards recovered from a deep hole. The original mass was an unusual oriented, shield-shape with a concave front and somewhat broader back. Within a few weeks it was acquired by H. Minod and subsequently sectioned and sold to various parties. The principal constituents are the expected kamacite, taenite, troilite, and (very sparse) schreibersite found in most meteoritic irons. However, N'Goureyma is — both crystallographically and geochemically — a very unusual iron meteorite. The kamacite is present as polycrystalline aggregates separated by taenite ribbons, but there is no Widmanstätten pattern. Troilite is both abundant and ubiquitous as very fine-grained inclusions. Minor constituents — chromite, schreibersite, and isocubanite — are each reported by at least two observers. Even though the meteorite is a witnessed fall, there is little crust with weather-produced limonite found in both crust and cracks — cracks which may already have been present when the meteorite struck the earth.
The N'Goureyma meteoroid was apparently structurally weakened by preterrestrial impact, the sustained pressures of its fiery atmospheric passage, and some unusually rapid tropical weathering before the meteorite pieces were eventually stored in relatively dry and quiet museums. N'Goureyma is one of only 4 witnessed I-ung falls. The 117 ungrouped irons constitute ~11% of the classified iron meteorites — presumably, the remnants of various asteroidal cores. Every meteorite is a somewhat enigmatic stranger to our planet — but the entangled history of this particular witnessed fall is perhaps more puzzling than most.
The largest masses are held at Heidelberg (4 kg) and Paris [Museum National d'Histoire Naturelle] (1.5 kg).
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
7 valid minerals.
Meteorite/Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
ⓘ Chromite Formula: Fe2+Cr3+2O4 Description: As euhedral, but somewhat brecciated crystals in troilite Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam, London: New York. 245 pages.; Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages. ; El Goresy, A. (1965) Mineralbestand und Strukturen der Graphit- und Sulfideinschlüsse in Eisenmeteoriten Geochemica et Cosmochimica Acta 29 (10): 1131-1151. (Oct 1965) |
ⓘ Iron Formula: Fe Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam, London: New York. 245 pages.; Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages. |
ⓘ Iron var. Kamacite Formula: (Fe,Ni) Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam, London: New York. 245 pages.; Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages. |
ⓘ Iron var. Martensite Formula: Fe Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages. |
ⓘ Isocubanite Formula: CuFe2S3 Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam, London: New York. 245 pages.; Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages. ; El Goresy, A. (1965) Mineralbestand und Strukturen der Graphit- und Sulfideinschlüsse in Eisenmeteoriten Geochemica et Cosmochimica Acta 29 (10): 1131-1151. (Oct 1965) |
ⓘ 'Limonite' Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages. |
ⓘ 'Plessite' Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages. |
ⓘ Schreibersite Formula: (Fe,Ni)3P Description: Buchwald (1975) later questioned Cohen's observations, but Ramdohr's confirmation seems rather definitive. Most observers are clear that the schreibersite is unusually sparse. Reference: Cohen, E. (1905) Meteoric iron from N'Goureyma, near Djenne, province of Moiena Soudan American Journal of Science (4th Series), vol 15 : 254-259 (w. photos).; Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam, London: New York. 245 pages. |
ⓘ Spinel Formula: MgAl2O4 Reference: El Goresy, A. (1965) Mineralbestand und Strukturen der Graphit- und Sulfideinschlüsse in Eisenmeteoriten Geochemica et Cosmochimica Acta 29 (10): 1131-1151. (Oct 1965) |
ⓘ Taenite Formula: (Fe,Ni) Description: As oriented 0.5-1 µ irregular ribbons in veined kamacite (Buchwald, 1975) Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam, London: New York. 245 pages.; Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages. |
ⓘ Troilite Formula: FeS Description: Many inclusions have the form of commas and droplets, tapering against the thin end of the mass. Troilite nodules are somewhat weathered. Reference: Cohen, E. (1905) Meteoric iron from N'Goureyma, near Djenne, province of Moiena Soudan American Journal of Science (4th Series), vol 15 : 254-259 (w. photos).; Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam, London: New York. 245 pages.; Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages. |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
ⓘ | Iron | 1.AE.05 | Fe |
ⓘ | var. Kamacite | 1.AE.05 | (Fe,Ni) |
ⓘ | var. Martensite | 1.AE.05 | Fe |
ⓘ | Schreibersite | 1.BD.05 | (Fe,Ni)3P |
ⓘ | Taenite | 1.AE.10 | (Fe,Ni) |
Group 2 - Sulphides and Sulfosalts | |||
ⓘ | Isocubanite | 2.CB.55b | CuFe2S3 |
ⓘ | Troilite | 2.CC.10 | FeS |
Group 4 - Oxides and Hydroxides | |||
ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
ⓘ | Spinel | 4.BB.05 | MgAl2O4 |
Unclassified Minerals, Rocks, etc. | |||
ⓘ | 'Limonite' | - | |
ⓘ | 'Plessite' | - |
List of minerals for each chemical element
O | Oxygen | |
---|---|---|
O | ⓘ Chromite | Fe2+Cr23+O4 |
O | ⓘ Spinel | MgAl2O4 |
Mg | Magnesium | |
Mg | ⓘ Spinel | MgAl2O4 |
Al | Aluminium | |
Al | ⓘ Spinel | MgAl2O4 |
P | Phosphorus | |
P | ⓘ Schreibersite | (Fe,Ni)3P |
S | Sulfur | |
S | ⓘ Troilite | FeS |
S | ⓘ Isocubanite | CuFe2S3 |
Cr | Chromium | |
Cr | ⓘ Chromite | Fe2+Cr23+O4 |
Fe | Iron | |
Fe | ⓘ Troilite | FeS |
Fe | ⓘ Schreibersite | (Fe,Ni)3P |
Fe | ⓘ Iron var. Kamacite | (Fe,Ni) |
Fe | ⓘ Taenite | (Fe,Ni) |
Fe | ⓘ Isocubanite | CuFe2S3 |
Fe | ⓘ Chromite | Fe2+Cr23+O4 |
Fe | ⓘ Iron var. Martensite | Fe |
Fe | ⓘ Iron | Fe |
Ni | Nickel | |
Ni | ⓘ Schreibersite | (Fe,Ni)3P |
Ni | ⓘ Iron var. Kamacite | (Fe,Ni) |
Ni | ⓘ Taenite | (Fe,Ni) |
Cu | Copper | |
Cu | ⓘ Isocubanite | CuFe2S3 |
References
Sort by
Year (asc) Year (desc) Author (A-Z) Author (Z-A)Cohen, E. (1905) Meteoric iron from N'Goureyma, near Djenne, province of Moiena Soudan American Journal of Science (4th Series), vol 15 : 254-259 (w. photos).
Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam, London: New York. 245 pages.
Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.
Grady, M. M. (2000) Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge, New York, Oakleigh, Madrid, Cape Town. 690 pages.
External Links
http://www.lpi.usra.edu/meteor/metbull.php = Meteoritical Bulletin Database
http://www.lpi.usra.edu/meteor/metbull.php?sea=N%27Goureyma&sfor=names&ants=&falls=&valids=&stype=contains&lrec=50&map=ge&browse=&country=All&srt=name&categ=All&mblist=All&rect=&phot=&snew=0&pnt=Normal%20table&code=16968
http://www.meteoritehistory.info/AJS/S4VIEWS/V15P071.HTM
http://evols.library.manoa.hawaii.edu/bitstream/handle/10524/35866/vol3-NewL-Norf(LO).pdf#page=5
http://www.lpi.usra.edu/meteor/get_original_photo.php?recno=5662131
http://www.lpi.usra.edu/meteor/metbull.php?sea=N%27Goureyma&sfor=names&ants=&falls=&valids=&stype=contains&lrec=50&map=ge&browse=&country=All&srt=name&categ=All&mblist=All&rect=&phot=&snew=0&pnt=Normal%20table&code=16968
http://www.meteoritehistory.info/AJS/S4VIEWS/V15P071.HTM
http://evols.library.manoa.hawaii.edu/bitstream/handle/10524/35866/vol3-NewL-Norf(LO).pdf#page=5
http://www.lpi.usra.edu/meteor/get_original_photo.php?recno=5662131
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