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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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Latitude & Longitude (WGS84):
12° 55' North , 11° 55' East
Latitude & Longitude (decimal):
Meteorite Class:
Meteoritical Society Class:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Geidam | 41,367 (2016) | 2.7km |
| Maïné Soroa | 10,699 (2013) | 34.8km |
| Dapchi | 14,077 (2016) | 65.1km |
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 — mostly barred olivine (BO) and radiating pyroxene (RP) — 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 Gallery Strunz Chemical ElementsMineral List
6 valid minerals.
Meteorite/Rock Types Recorded
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ Chromite Formula: Fe2+Cr3+2O4 |
| ⓘ 'Clinopyroxene Subgroup' |
| ⓘ 'Fayalite-Forsterite Series' |
| ⓘ Ilmenite Formula: Fe2+TiO3 |
| ⓘ Native Copper Formula: Cu |
| ⓘ Native Iron Formula: Fe |
| ⓘ Native Iron var. Kamacite Formula: (Fe,Ni) |
| ⓘ 'Orthopyroxene Subgroup' |
| ⓘ 'Plagioclase' Formula: (Na,Ca)[(Si,Al)AlSi2]O8 Description: Plagioclase, rich in inclusions, is very fine grained and turbid. |
| ⓘ Taenite Formula: (Ni,Fe) |
| ⓘ Troilite Formula: FeS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Copper | 1.AA.05 | Cu |
| ⓘ | Native Iron | 1.AE.05 | Fe |
| ⓘ | var. Kamacite | 1.AE.05 | (Fe,Ni) |
| ⓘ | Taenite | 1.AE.10 | (Ni,Fe) |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Troilite | 2.CC.10 | FeS |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
| ⓘ | Ilmenite | 4.CB.05 | Fe2+TiO3 |
| Unclassified | |||
| ⓘ | 'Clinopyroxene Subgroup' | - | |
| ⓘ | 'Fayalite-Forsterite Series' | - | |
| ⓘ | 'Plagioclase' | - | (Na,Ca)[(Si,Al)AlSi2]O8 |
| ⓘ | 'Orthopyroxene Subgroup' | - | |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| O | ⓘ Ilmenite | Fe2+TiO3 |
| O | ⓘ Fayalite-Forsterite Series | |
| O | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Na | Sodium | |
| Na | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Mg | Magnesium | |
| Mg | ⓘ Fayalite-Forsterite Series | |
| Al | Aluminium | |
| Al | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Si | Silicon | |
| Si | ⓘ Fayalite-Forsterite Series | |
| Si | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| S | Sulfur | |
| S | ⓘ Troilite | FeS |
| Ca | Calcium | |
| Ca | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Ti | Titanium | |
| Ti | ⓘ Ilmenite | Fe2+TiO3 |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | Iron | |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | ⓘ Ilmenite | Fe2+TiO3 |
| Fe | ⓘ Native Iron | Fe |
| Fe | ⓘ Native Iron var. Kamacite | (Fe,Ni) |
| Fe | ⓘ Taenite | (Ni,Fe) |
| Fe | ⓘ Troilite | FeS |
| Fe | ⓘ Fayalite-Forsterite Series | |
| Ni | Nickel | |
| Ni | ⓘ Native Iron var. Kamacite | (Fe,Ni) |
| Ni | ⓘ Taenite | (Ni,Fe) |
| Cu | Copper | |
| Cu | ⓘ Native Copper | Cu |
Other Regions, Features and Areas containing this locality
AfricaContinent
African PlateTectonic Plate
- Tuareg Shield
- Eastern Hoggar BeltVolcanic Arc
West AfricaUN Subregion
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