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| Allan Hills A81029 | |||||||||||||||||||||
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| Basic information | Name: Allan Hills A81029 This is an OFFICIAL meteorite name. Abbreviation: ALHA81029 This meteorite may also be called Allan Hills 81029 (ALH 81029) in publications. Observed fall: No Year found: 1981 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass:  153 g | ||||||||||||||||||||
| 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(2):
Sample No.: ALHA81029 Location: Allan Hills Field No.: 1563 Weight (gms): 153.0 Meteorite Type: L6 Chondrite
Physical Description: Carol Schwarz This specimen consists of two pieces which fit together. One surface has shiny black fusion crust while the others are weathered to an iridescent red brown. The interior is weathered. Dimensions: 9.5 x 5 x 2.5 cm
Petrographic Description: Brian Mason Chondrules are sparse and poorly defined, tending to merge with the granular groundmass, which consists largely of olivine and pyroxene, with minor amounts of maskelynite, nickel-iron, and troilite. The meteorite is extensively weathered, the section being uniformly stained with brown limonite. Microprobe analyses gave the following compositions: olivine, Fa25 orthopyroxene, Fs21; the maskelynite has CaO (2.1%) appropriate to oligoclase composition, but Na2O is low and variable (3.2-4.1%). The meteorite is classified as an L6 chondrite.
The section of ALHA81028 is similar in all respects; it has a veinlet up to 0.2 mm of fine-grained material which appears to consist largely of majorite and ringwoodite. ALHA81027 is similar, and these three meteorites are possibly paired. | ||||||||||||||||||||
| Data from: MB76 Table 2 Line 552: |
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| References: | Published in Antarctic Meteorite Newsletter 6(2) (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 44547 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
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