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| Allan Hills A81101 | |||||||||||||||||||||
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| Basic information | Name: Allan Hills A81101 This is an OFFICIAL meteorite name. Abbreviation: ALHA81101 This meteorite may also be called Allan Hills 81101 (ALH 81101) in publications. Observed fall: No Year found: 1981 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass:  119.2 g | ||||||||||||||||||||
| Classification history: |
This is 1 of 660 approved meteorites classified as Ureilite. [show all] Search for other: Achondrites, Ureilites | ||||||||||||||||||||
| Writeup |
Writeup from AMN 6(2):
Sample No.: ALHA81101 Location: Allan Hills Field No.: 1634 Weight (gms): 119.2 Meteorite Type: Ureilite
Physical Description: Carol Schwarz Fusion crust occurs on two sides of this specimen. The other sides have a rough surface, dark brown in color with gray inclusions. The interior is medium gray and not extensively weathered. It appears to be fractured or shocked, having a blocky texture. Dimensions: 7.2 x 4.5 x 3 cm
Petrographic Description: Brian Mason The section shows an aggregate of subhedral to anhedral crystals of olivine, 1-3 mm across; they are rimmed with dark carbonaceous material. Pyroxene, if present, is in sma1l amount. Accessory nickel-iron is present, as minute grains along grain boundaries and fractures; it is partly altered to brown limonite. Under crossed polars the olivine crystals are seen as a mosaic of tiny grains averaging 0.05 mm across, evidently a shock effect. Microprobe analyses show olivine of variable composition, Fa10-22, mean Fa19. The meteorite is a ureilite; it differs from previously described ureilite from the Allan Hills in the mosaic texture of the olivine. | ||||||||||||||||||||
| Data from: MB76 Table 2 Line 624: |
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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 44543 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
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| Revision history: |
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