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Geidam meteorite, Geidam, Yobe, Nigeriai
Regional Level Types
Geidam meteoriteMeteorite Fall Location
GeidamLocal Government Area
YobeState
NigeriaCountry

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Key
Latitude & Longitude (WGS84):
12° 55' North , 11° 55' East
Latitude & Longitude (decimal):
Meteorite Class:
Meteoritical Society Class:
Nearest Settlements:
PlacePopulationDistance
Geidam41,367 (2016)2.7km
MaΓ―nΓ© Soroa10,699 (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 Elements

Mineral 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 Diagram

Detailed 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“˜Copper1.AA.05Cu
β“˜Iron1.AE.05Fe
β“˜var: Kamacite1.AE.05(Fe,Ni)
β“˜Taenite1.AE.10(Fe,Ni)
Group 2 - Sulphides and Sulfosalts
β“˜Troilite2.CC.10FeS
Group 4 - Oxides and Hydroxides
β“˜Chromite4.BB.05Fe2+Cr3+2O4
β“˜Ilmenite4.CB.05Fe2+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“˜Copper1.1.1.3Cu
β“˜Iron
var: Kamacite
1.1.11.1(Fe,Ni)
β“˜Taenite1.1.11.2(Fe,Ni)
Group 2 - SULFIDES
AmXp, with m:p = 1:1
β“˜Troilite2.8.9.1FeS
Group 4 - SIMPLE OXIDES
A2X3
β“˜Ilmenite4.3.5.1Fe2+TiO3
Group 7 - MULTIPLE OXIDES
AB2X4
β“˜Chromite7.2.3.3Fe2+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

OOxygen
Oβ“˜ ChromiteFe2+Cr23+O4
Oβ“˜ IlmeniteFe2+TiO3
SSulfur
Sβ“˜ TroiliteFeS
TiTitanium
Tiβ“˜ IlmeniteFe2+TiO3
CrChromium
Crβ“˜ ChromiteFe2+Cr23+O4
FeIron
Feβ“˜ ChromiteFe2+Cr23+O4
Feβ“˜ TroiliteFeS
Feβ“˜ IlmeniteFe2+TiO3
Feβ“˜ Iron (var: Kamacite)(Fe,Ni)
Feβ“˜ Taenite(Fe,Ni)
Feβ“˜ IronFe
NiNickel
Niβ“˜ Iron (var: Kamacite)(Fe,Ni)
Niβ“˜ Taenite(Fe,Ni)
CuCopper
Cuβ“˜ CopperCu

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


Other Regions, Features and Areas containing this locality

African PlateTectonic Plate
West AfricaUN Subregion

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