Xi Ujimgin meteorite, West Ujimqin Banner (Xiwuzhumuqin Co.), Xilingol League (Xilinguole Prefecture), Inner Mongolia, Chinai
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Latitude & Longitude (WGS84):
44° 40' North , 117° 30' East
Latitude & Longitude (decimal):
Meteorite Class:
Meteoritical Society Class:
Köppen climate type:
Name(s) in local language(s):
, 内蒙古自治区, 中国
Ordinary chondrite, (L/LL6-an; S2)
Fall, 24 August 1980, 17 hrs; 5.9 kg
A single mass was recovered after an afternoon fall. Inspections revealed a largely equilibrated ordinary chondrite. Total iron (23.53 wt%) is consistent with an L-chondrite classification. Olivine (Fa~26.1) composition is very near the boundary of L and LL chondrite composition. A few mineralogical phases are referenced below, but petrographic studies in more accessible literature have been limited in scope. Instead, research citations have centered on Xi Ujimgin's ambiguous chemical signatures [e.g., high cobalt in matrix kamacite]. The somewhat arbitrary nature of the compositional 'borders' between L and L chondrites and the lack of other consistent indicators of Xi Ujimgin's relationship to either the L or LL group of ordinary chondrites has eventually resulted in its current classification as a rare L/LL ordinary chondrite.
A U,Th-He age of 4.45 Ga as well as a relatively high cosmic ray exposure (CRE) age of ~51 Ma have been reported.
Xi Ujimgin is the only meteorite currently classified as an 'anomalous' L/LL6-an chondrite as of early 2017 and one of only 11 witnessed L/LL falls. The main mass has been at the Beijing Planetarium with a much smaller mass (117 g) at UCLA.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
2 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 |
| ⓘ 'Fayalite-Forsterite Series' Description: Rubin (1990)'s Fa26.4 differs slitely from the Grady (2000) value. References: |
| ⓘ Native Iron Formula: Fe |
| ⓘ Native Iron var. Kamacite Formula: (Fe,Ni) References: |
| ⓘ Native Iron var. Martensite Formula: Fe |
| ⓘ 'Plagioclase' Formula: (Na,Ca)[(Si,Al)AlSi2]O8 |
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) |
| ⓘ | var. Martensite | 1.AE.05 | Fe |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
| Unclassified | |||
| ⓘ | 'Fayalite-Forsterite Series' | - | |
| ⓘ | 'Plagioclase' | - | (Na,Ca)[(Si,Al)AlSi2]O8 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| 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 |
| Ca | Calcium | |
| Ca | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | Iron | |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | ⓘ Native Iron | Fe |
| Fe | ⓘ Native Iron var. Kamacite | (Fe,Ni) |
| Fe | ⓘ Fayalite-Forsterite Series | |
| Fe | ⓘ Native Iron var. Martensite | Fe |
| Ni | Nickel | |
| Ni | ⓘ Native Iron var. Kamacite | (Fe,Ni) |
Other Regions, Features and Areas containing this locality
Amur PlateTectonic Plate
AsiaContinent
China
- Inner Mongolia
- Southern Great Xing’an RangeMineral Belt
Eurasian Plate
- Henegshan-Baolidao Accretionary ComplexAccretionary Complex
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References
Rubin, Alan E. (1990) Kamacite and olivine in ordinary chondrites: Intergroup and intragroup relationships. Geochimica et Cosmochimica Acta, 54 (5) 1217-1232 doi:10.1016/0016-7037(90)90148-e
