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| Allan Hills A81261 | |||||||||||||||||||||||||||||
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| Basic information | Name: Allan Hills A81261 This is an OFFICIAL meteorite name. Abbreviation: ALHA81261 This meteorite may also be called Allan Hills 81261 (ALH 81261) in publications. Observed fall: No Year found: 1981 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass:  11.8 g | ||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 91 approved meteorites classified as Acapulcoite. [show all] Search for other: Acapulcoite-lodranite family, Acapulcoites, and Primitive achondrites | ||||||||||||||||||||||||||||
| Writeup |
Writeup from AMN 8(1):
Sample No.: ALHA81261 Location: Allan Hills Weight (g): 11.8 Field No.: 1255 Dimensions (cm): 2 x 1.5 x 1.5 Meteorite Type: H(?) Chondrite
Macroscopic Description: Roberta Score Brown and black fusion crust covers 50% of this meteorite fragment. The interior is medium to light gray in color. Metal is abundant. A weathering rind was exposed when the stone was chipped.
Thin Section (,2) Description: Brian Mason The section shows that this meteorite is an equigranular (grains 0.1-0.4 mm) aggregate of approximately equal amounts of olivine and orthopyroxene, with minor amounts of nickel-iron, plagioclase, troilite, diopside, and accessory chromite. A little limonitic staining is present around metal grains. Microprobe analyses show the minerals are uniform in composition: olivine, Fa11.3; orthopyroxene, Wo2Fs11; plagioclase, An14Or4. This specimen is identical in all respects with ALHA77081, classed as an H(?) meteorite, and the two are almost certainly paired. The mineral analyses are indistinguishable from those of Acapulco (Palme et al., Geochimica et Cosmochimica Acta, 45, p. 728, 1981). | ||||||||||||||||||||||||||||
| Data from: MB76 Table 2 Line 783: |
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| References: | Published in Antarctic Meteorite Newsletter 8(1) (1985), 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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