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| Allan Hills 83009 | |||||||||||||||||||||
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| Basic information | Name: Allan Hills 83009 This is an OFFICIAL meteorite name. Abbreviation: ALH 83009 Observed fall: No Year found: 1983 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass:  1.7 g | ||||||||||||||||||||
| Classification history: |
This is 1 of 79 approved meteorites classified as Aubrite. [show all] Search for other: Achondrites, Aubrites, Enstatite achondrites, and Enstatite-rich meteorites | ||||||||||||||||||||
| Writeup |
Writeup from AMN 8(1):
Sample No.: ALH83009 Location: Allan Hills Weight (g): 1.7 Field No.: 2100 Dimensions (cm): 1.5 x 1.0 x 0.5 Meteorite Type: Aubrite
Macroscopic Description: Roberta Score This specimen is white in color and is identical to ALH83015.
Thin Section (,1) Description: Jeremy Delaney This is a coarse-grained, brecciated aubrite with several unbrecciated lithic fragments preserved. Orthopyroxene grains have interfingering texture. One grain with inclined extinction appears to be clinoenstatite. Generally no exsolution was observed. One small calcic pyroxene was observed in a 1 mm + orthopyroxene grain containing needle-like inclusions. Some orthopyroxene grains contain rounded melt pockets with extremely fine-grained needle-like crystallites of unidentified silicates. Orthopyroxene is En99.6Wo0.34 and feldspar is Ab90Or3.2. Other phases include daubreelite, alabandite, Fe-Ni metal and Ti-bearing troilite. | ||||||||||||||||||||
| Data from: MB76 Table 2 Line 892: |
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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 44048 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
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