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| Allan Hills A78188 | |||||||||||||||||||||
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| Basic information | Name: Allan Hills A78188 This is an OFFICIAL meteorite name. Abbreviation: ALHA78188 This meteorite may also be called Allan Hills 78188 (ALH 78188) in publications. Observed fall: No Year found: 1978 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass:  0.9 g | ||||||||||||||||||||
| 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.: ALHA78188 Location: Allan Hills Field No.: 040 Weight (gms): 0.87 Meteorite Type: L3 Chondrite
Physical Description: No fusion crust remains on this reddish-brown totally weathered sample.
Petrographic Description: Brian Mason The meteorite consists of a close-packed aggregate of chondrules, 0.3-1.2 mm across, with a relatively small amount of matrix. Porphyritic olivine chondrule contain intergranular glass, some of which is transparent brown but much is turbid from partial devitrification. Other chondrules consist of granular olivine and polysynthetically-twinned low-Ca clinopyroxene. Many chondrules have dark rims consisting largely of troilite. A little nickel-iron is present. Weathering is extensive, with veins and patches of brown limonite throughout the section. Microprobe analyses show variable composition for both olivine and pyroxene; olivine, Fa1-34, average Fa15; pyroxene, Fs5-29, average Fs17. The variability in olivine and pyroxene composition indicates type 3, and the low metal content suggest L group, so the meteorite is tentatively classified an L3 chondrite. | ||||||||||||||||||||
| Data from: MB76 Table 2 Line 396: |
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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 40759 approved meteorites from Antarctica (plus 4494 unapproved names) | ||||||||||||||||||||
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