Geidam meteorite, Geidam, Yobe, Nigeriai
Regional Level Types | |
---|---|
Geidam meteorite | Meteorite Fall Location |
Geidam | Local Government Area |
Yobe | State |
Nigeria | Country |
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Key
Latitude & Longitude (WGS84):
12° 55' North , 11° 55' East
Latitude & Longitude (decimal):
Locality type:
Meteorite Class:
Meteoritical Society Class:
KΓΆppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Geidam | 41,367 (2016) | 2.7km |
MaΓ―nΓ© Soroa | 10,699 (2013) | 34.8km |
Ordinary chondrite (H5)
Fell, 6 July 1950; 725 g
After falling near the village of Garau, a meteoritic stone was broken up and then presented to a district head before eventually reaching the Geological Survey. The meteorite is dominated by olivine (Fa19) and orthopyroxene (Fs16) with quite minor amounts of clinopyroxene and albitic plagioclase (An10). Chondrules β mostly barred olivine (BO) and radiating pyroxene (RP) β are present, but usually small (0.5mm ). Fe-Ni metal and troilite are present as irregular grains between the chondrules irregular. Chromite, copper, and an unidentified phosphate are also reported.
The composition of olivine and orthopyroxene as well as total iron (27.2 wt%) are characteristic of the ordinary H chondrite geochemical group. The H group of ordinary chondrites (ordinary chondrites relatively high in total Iron) account for more than 30% of all meteorite falls. As of 2000 the main mass had been held at the Geological Survey of Nigeria for approximately 5 decades.
Nota bene: Geidem is the name of the largest nearby town, but Geidam is still used for some local landmarks as well as for the meteorite.
Select Mineral List Type
Standard Detailed Strunz Dana Chemical ElementsMineral List
6 valid minerals.
Meteorite/Rock Types Recorded
Note: this is a very new system on mindat.org and 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:
β 'Albite-Anorthite Series' Description: Plagioclase, rich in inclusions, is very fine grained and turbid. Reference: Mason, B. & Wiik, H.B. (1965) The Composition of the Forest City, Tennasilm, Weston, and Geidam Meteorites. American Museum Novitates, No. 2220, New York. 20 pages. (June 1965). |
β Chromite Formula: Fe2+Cr3+2O4 Reference: Mason, B. & Wiik, H.B. (1965) The Composition of the Forest City, Tennasilm, Weston, and Geidam Meteorites. American Museum Novitates, No. 2220, New York. 20 pages. (June 1965). ; Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages. |
β 'Clinopyroxene Subgroup' Reference: Mason, B. & Wiik, H.B. (1965) The Composition of the Forest City, Tennasilm, Weston, and Geidam Meteorites. American Museum Novitates, No. 2220, New York. 20 pages. (June 1965). |
β Copper Formula: Cu Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages. |
β 'Fayalite-Forsterite Series' Reference: Mason, B. & Wiik, H.B. (1965) The Composition of the Forest City, Tennasilm, Weston, and Geidam Meteorites. American Museum Novitates, No. 2220, New York. 20 pages. (June 1965). |
β Ilmenite Formula: Fe2+TiO3 Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages. |
β Iron Formula: Fe Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages. |
β 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. |
β 'Orthopyroxene Subgroup' Reference: Mason, B. & Wiik, H.B. (1965) The Composition of the Forest City, Tennasilm, Weston, and Geidam Meteorites. American Museum Novitates, No. 2220, New York. 20 pages. (June 1965). |
β Taenite Formula: (Fe,Ni) Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages. |
β Troilite Formula: FeS Reference: Mason, B. & Wiik, H.B. (1965) The Composition of the Forest City, Tennasilm, Weston, and Geidam Meteorites. American Museum Novitates, No. 2220, New York. 20 pages. (June 1965). ; Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages. |
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
β | Copper | 1.AA.05 | Cu |
β | Iron | 1.AE.05 | Fe |
β | var: Kamacite | 1.AE.05 | (Fe,Ni) |
β | Taenite | 1.AE.10 | (Fe,Ni) |
Group 2 - Sulphides and Sulfosalts | |||
β | Troilite | 2.CC.10 | FeS |
Group 4 - Oxides and Hydroxides | |||
β | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
β | Ilmenite | 4.CB.05 | Fe2+TiO3 |
Unclassified Minerals, Rocks, etc. | |||
β | 'Albite-Anorthite Series' | - | |
β | 'Clinopyroxene Subgroup' | - | |
β | 'Fayalite-Forsterite Series' | - | |
β | 'Orthopyroxene Subgroup' | - |
List of minerals arranged by Dana 8th Edition classification
Group 1 - NATIVE ELEMENTS AND ALLOYS | |||
---|---|---|---|
Metals, other than the Platinum Group | |||
β | Copper | 1.1.1.3 | Cu |
β | Iron var: Kamacite | 1.1.11.1 | (Fe,Ni) |
β | Taenite | 1.1.11.2 | (Fe,Ni) |
Group 2 - SULFIDES | |||
AmXp, with m:p = 1:1 | |||
β | Troilite | 2.8.9.1 | FeS |
Group 4 - SIMPLE OXIDES | |||
A2X3 | |||
β | Ilmenite | 4.3.5.1 | Fe2+TiO3 |
Group 7 - MULTIPLE OXIDES | |||
AB2X4 | |||
β | Chromite | 7.2.3.3 | Fe2+Cr3+2O4 |
Unclassified Minerals, Mixtures, etc. | |||
β | 'Albite-Anorthite Series' | - | |
β | 'Clinopyroxene Subgroup' | - | |
β | 'Fayalite-Forsterite Series' | - | |
β | Iron | - | Fe |
β | 'Orthopyroxene Subgroup' | - |
List of minerals for each chemical element
O | Oxygen | |
---|---|---|
O | β Chromite | Fe2+Cr23+O4 |
O | β Ilmenite | Fe2+TiO3 |
S | Sulfur | |
S | β Troilite | FeS |
Ti | Titanium | |
Ti | β Ilmenite | Fe2+TiO3 |
Cr | Chromium | |
Cr | β Chromite | Fe2+Cr23+O4 |
Fe | Iron | |
Fe | β Chromite | Fe2+Cr23+O4 |
Fe | β Troilite | FeS |
Fe | β Ilmenite | Fe2+TiO3 |
Fe | β Iron (var: Kamacite) | (Fe,Ni) |
Fe | β Taenite | (Fe,Ni) |
Fe | β Iron | Fe |
Ni | Nickel | |
Ni | β Iron (var: Kamacite) | (Fe,Ni) |
Ni | β Taenite | (Fe,Ni) |
Cu | Copper | |
Cu | β Copper | Cu |
References
Sort by
Year (asc) Year (desc) Author (A-Z) Author (Z-A)Krinov, E. L. - Editor (1964) The Meteoritical Bulletin, No. 30. Moscow.
Mason, B. & Wiik, H.B. (1965) The Composition of the Forest City, Tennasilm, Weston, and Geidam Meteorites. American Museum Novitates, No. 2220, New York. 20 pages. (June 1965).
Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.
Grady, M.M (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.
External Links
http://www.lpi.usra.edu/meteor/metbull.php - MeteoriticalBulletinDatabase
http://www.lpi.usra.edu/meteor/metbull.php?code=10870 -Geidam@MetBullDatabase
http://www.lpi.usra.edu/meteor/get_original_photo.php?recno=5629739 - Geidam photo
http://www.lpi.usra.edu/meteor/metbull.php?code=10870 -Geidam@MetBullDatabase
http://www.lpi.usra.edu/meteor/get_original_photo.php?recno=5629739 - Geidam photo
Other Regions, Features and Areas containing this locality
African PlateTectonic Plate
West AfricaUN Subregion
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