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| Allan Hills A79018 | |||||||||||||||||||||
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| Basic information | Name: Allan Hills A79018 This is an OFFICIAL meteorite name. Abbreviation: ALHA79018 This meteorite may also be called Allan Hills 79018 (ALH 79018) in publications. Observed fall: No Year found: 1979 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass:  120.7 g | ||||||||||||||||||||
| Classification history: |
This is 1 of 12583 approved meteorites (plus 8 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 4(1):
Sample No.: ALHA79018 Location: Allan Hills Field No.: 1175 Weight (gms): 120.7 Meteorite Type: L6 Chondrite
Physical Description: Roberta Score Thin brown and black patchy fusion crust covers all but one surface of this stone. This particular surface ranges in color from yellow to deep reddish-brown. Several inclusions are visible. The interior surfaces are mainly weathered with small areas of fresh material. Several black veins are apparent which may have been cracks that have oxidized severely. Several rounded inclusions up to 3 mm in diameter exist. Dimensions: 4.5 x 5.0 x 3.5 cm.
Petrographic Description: Brian Mason Chondritic structure is barely discernible, the section showing a granular aggregate consisting largely of olivine and pyroxene, with minor amounts of maskelynite, nickel-iron, and troilite, and accessory chromite. An irregular enclave, 3.6 mm in maximum dimension, consists of fine-grained intergrown olivine and maskelynite. Veins, up to 0.3 mm thick, appear to contain ringwoodite and majorite. Fusion crust is present along one edge of the section; patches of limonite are present. Microprobe analyses gave the following compositions: olivine, Fa23 (Fa25 in the enclave); pyroxene, Fs20; the maskelynite has CaO content (2.2%) appropriate to oligoclase, but the Na2O is low and variable (Na2O= 1.0-3.8%). The meteorite is classified as an L6 chondrite. | ||||||||||||||||||||
| Data from: MB76 Table 2 Line 456: |
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| References: | Published in Antarctic Meteorite Newsletter 4(1) (1981), 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 44248 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
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