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Allan Hills A79001 | |||||||||||||||||||||
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Basic information | Name: Allan Hills A79001 This is an OFFICIAL meteorite name. Abbreviation: ALHA79001 This meteorite may also be called Allan Hills 79001 (ALH 79001) in publications. Observed fall: No Year found: 1979 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass: ![]() | ||||||||||||||||||||
Classification history: |
This is 1 of 95 approved meteorites classified as L3.5. [show all] Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||
Writeup![]() |
Writeup from AMN 4(1):
Sample No.: ALHA79001 Location: Allan Hills Field No.: 1171 Weight (gms): 32.31 Meteorite Type: L3 Chondrite (tentative)
Physical Description: Roberta Score Five exterior surfaces have a dull reddish-brown color while the sixth surface has a iridescent reddish-brown color. Though the interior is extremely weathered, clasts are visible. ALHA79001 and ALHA79003 are probably the same meteorite. Dimensions: 4 x 3.5 x 1.5
Petrographic Description: Brian Mason The polished thin section shows a closely packed aggregate of chondrules (0.2-2 mm in diameter) and irregular crystalline aggregates, set in a small amount of dark fine-grained matrix which includes minor subequal amounts of nickel-iron and troilite. A considerable variety of chondrules is present, the most common being granular olivine with or without polysynthetically twinned clinopyroxene, porphyritic olivine, and fine-grained pyroxene. Some chondrules have intergranular transparent pale brown glass, in others the glass is turbid and partly devitrified. Some weathering is indicated by the presence of a moderate amount of brown limonite as veins and patches. Microprobe analyses show a wide range in the composition of olivine (Fa6-39) and pyroxene (Fs2-31); the pyroxene is a low-calcium clinopyroxene (CaO = 0.2-1.8%). This range of composition, together with the presence of glass and twinned clinopyroxene, indicates type 3, and the small amount of nickel-iron suggests L group; the meteorite is therefore tentatively classed as an L3 chondrite. | ||||||||||||||||||||
Data from: MB76 Table 2 Line 439: |
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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:![]() |
Statistics: This is 1 of 43700 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
Proximity search: |