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| Allan Hills 84170 | |||||||||||||||||||||||||
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| Basic information | Name: Allan Hills 84170 This is an OFFICIAL meteorite name. Abbreviation: ALH 84170 Observed fall: No Year found: 1984 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass:  39.2 g | ||||||||||||||||||||||||
| Classification history: |
This is 1 of 140 approved meteorites classified as EH3. [show all] Search for other: EH chondrites, Enstatite chondrites, Enstatite chondrites (type 3), and Enstatite-rich meteorites | ||||||||||||||||||||||||
| Writeup |
Writeup from AMN 9(3):
Sample No.: ALH84170 Location: Allan Hills Weight (g): 39.2 Field No.: 2535 Dimensions (cm): 3.5 x 3 x 2 Meteorite Type: E3 Chondrite
Macroscopic Description: Roberta Score Fifty percent of this fragment is covered by extremely weathered brown fusion crust. The exposed interior has a black matrix with numerous white to gray rounded and irregular-shaped inclusions. ALH84170 is a coherent specimen.
Thin Section (,2) Description: Brian Mason Chondrules are abundant, ranging from 0.3-2.0 mm across; they consist of radiating or granular pyroxene, some with olivine. The matrix is made up of chondrule fragments and mineral grains, with a considerable amount of opaque materials (nickel-iron and sulfides). Weathering is extensive, with brown limonitic staining throughout the section. Microprobe analyses show many grains of olivine and pyroxene close to Mg2SiO4 and MgSiO3 in composition, but some contain a considerable amount of iron. The nickel-iron contains 2.2-3.0% Si. The meteorite is an enstatite chondrite, and the unequilibrated compositions of the olivine and pyroxene suggest the E3 classification. | ||||||||||||||||||||||||
| Data from: MB76 Table 2 Line 1135: |
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| References: | Published in Antarctic Meteorite Newsletter 9(3) (1986), 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 43856 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||
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