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| Allan Hills A81027 | |||||||||||||||||||||
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| Basic information | Name: Allan Hills A81027 This is an OFFICIAL meteorite name. Abbreviation: ALHA81027 This meteorite may also be called Allan Hills 81027 (ALH 81027) in publications. Observed fall: No Year found: 1981 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass:  3.84 kg | ||||||||||||||||||||
| Classification history: |
This is 1 of 12780 approved meteorites (plus 11 unapproved names) classified as L6. [show all] Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||
| Writeup |
Writeup from AMN 6(1):
Sample No.: ALHA81027 Location: Allan Hills Field No.: 1556, 1557 Weight (gms): 3835.3 Meteorite Type: Shocked L6 Chondrite
Physical Description: Roberta Score ALHA81027 consists of two pieces that fit together perfectly but do not form a complete specimen. Patchy fusion crust covers most of the meteorite. The broken surfaces are smooth and reddish-brown. The interior of the smaller of the two pieces is totally weathered. Dimensions: 17 x 11.5 x 10 cm
Petrographic Description: Brian Mason Chondrules are barely discernable, merging with the granular groundmass, which consists largely of olivine and pyroxene, with minor amounts of maskelynite, nickel-iron, and troilite. Remnants of fusion crust rim part of the section. Minor weathering is indicated by brown limonitic staining around metal grains. Microprobe analyses give the following compositions: olivine, Fa25 orthopyroxene, Fs21; maskelynite has CaO content equivalent to An10 but Na2O is low and variable, 4.0-5.2%. The meteorite is a shocked L6 chondrite. | ||||||||||||||||||||
| Data from: MB76 Table 2 Line 550: |
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| References: | Published in Antarctic Meteorite Newsletter 6(1) (1983), 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 44543 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
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