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| Allan Hills 83018 | |||||||||||||||||||||||||
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| Basic information | Name: Allan Hills 83018 This is an OFFICIAL meteorite name. Abbreviation: ALH 83018 Observed fall: No Year found: 1983 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass:  3.7 g | ||||||||||||||||||||||||
| Classification history: |
This is 1 of 130 approved meteorites classified as EL6. [show all] Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), and Enstatite-rich meteorites | ||||||||||||||||||||||||
| Writeup |
Writeup from AMN 10(2):
Sample No.: ALH83018 Location: Allan Hills Weight (g): 3.7 Field No.: 2139 Dimensions (cm): 2.5 x 1.7 x 4 Meteorite Type: E6 Chondrite
Macroscopic Description: Carol Schwarz This flat meteorite fragment has weathered fusion crust on the top and a weathered fracture surface on the bottom. The interior is dark and weathered. Metal is abundant.
Thin Section (,2) Description: Brian Mason Chondritic structure is barely discernable in the section, which consists largely of granular and prismatic enstatite (grains averaging 0.15 mm), with considerable nickel-iron, minor troilite and plagioclase, and traces of sinoite (Si2N20, recognized by its high birefringence). Considerable weathering is indicated by areas of brown limonite and limonitic staining throughout the section. Fusion crust is present along one edge. Microprobe analyses show that the enstatite is almost pure MgSiO3 (FeO 0.1-0.2, CaO 0.7-0.8%); plagioclase is An14Or4; the nickel-iron contains 1.2% Si. The meteorite is an E6 chondrite, very similar to ALH81021 in all respects. | ||||||||||||||||||||||||
| Data from: MB76 Table 2 Line 901: |
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| References: | Published in Antarctic Meteorite Newsletter 10(2) (1987), JSC, Houston Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography:
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Statistics: This is 1 of 43856 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||
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