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| Allan Hills 90411 | |||||||||||||||||||||||||
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| Basic information | Name: Allan Hills 90411 This is an OFFICIAL meteorite name. Abbreviation: ALH 90411 Observed fall: No Year found: 1990 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass:  5.84 kg | ||||||||||||||||||||||||
| Classification history: |
This is 1 of 51 approved meteorites classified as L3.7. [show all] Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||||||
| Writeup |
Writeup from AMN 14(2):
Sample No.: ALH90411 Location: Allan Hills Field Number: 6609 Dimensions (cm): 28 x 16.5 x 7.5 Weight (g): 5836.5 Meteorite Type: L3 chondrite
Macroscopic Description: Robbie Marlow Exterior is ~90% covered with dull black fusion crust. Evaporite deposit is visible on one exterior surface. Fractures penetrate deeply into the interior in several locations. Interior matrix is light gray and oxidation is scattered throughout. Numerous millimeter-sized chondrules are present.
Thin Section (,6) Description: Brian Mason The section shows a close-packed aggregate of chondrules and chondrule fragments, up to 2.4 mm across, in a matrix of fine-grained olivine and pyroxene with a minor amount of nickel-iron and troilite. Some weathering is indicated by brown limonitic staining around metal grains. Microprobe analyses show olivine and pyroxene of variable composition: olivine, Fa4-24, mean Fa21 (CV FeO is 34); pyroxene, Fs5-14. The amount of nickel-iron suggests L group, and the variability of olivine and pyroxene compositions type 3, hence the meteorite is classified as an L3 chondrite (estimated L3.6).
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| Data from: MB76 Table 2 Line 1409: |
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| References: | Published in Antarctic Meteorite Newsletter 14(2) (1991), 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 43840 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||
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