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| MacAlpine Hills 88174 | |||||||||||||||||||||
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| Basic information | Name: MacAlpine Hills 88174 This is an OFFICIAL meteorite name. Abbreviation: MAC 88174 Observed fall: No Year found: 1988 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass:  98.4 g | ||||||||||||||||||||
| Classification history: |
This is 1 of 20 approved meteorites classified as H3.5. [show all] Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||
| Comments: | Field number: 6156 | ||||||||||||||||||||
| Writeup |
Writeup from AMN 13(2):
Sample No. MAC88174 Location: MacAlpine Hills Dimensions (cm): 6 x 4 x 3.2 Field Number: 6156 Weight (g): 98.4 Meteorite Type: H3 chondrite
Macroscopic Description Robbie Marlow The exterior of MAC88174 Is mostly covered with thin, very smooth dark brown fusion crust. This meteorite' is quite coherent, making it difficult to break. The interior matrix is dark gray with abundant millimeter sized white chondrules/inclusions. A 2 mm thick weathering rind is present. Evaporite minerals were noted.
Thin Section (,4) Description: Brian Mason The section shows a close-packed aggregate of chondrules and chondrule fragments, up to 1.5 mm across, in a finely granular matrix which contains some nickel-iron and troilite. Most chondrules consist of granular to porphyritic olivine and olivine-pyroxene, but barred olivine and cryptocrystalline pyroxene chondrules were noted. Microprobe analyses show olivine and pyroxene of variable composition; olivine, Fa1-24 (CV FeO is 67); pyroxene, Fs2-12. The variability of olivine and pyroxene compositions indicates type 3, and the amount of nickel-iron suggests H group, hence the meteorite is tentatively classified as an H3 chondrite (estimated H3.3).
[From AMN 13(3):] Sample No. MAC88174 Location: MacAlpine Hills Dimensions (cm): 6x4x3.2 Field Number: 6156 Weight (g): 98.4 Meteorite Type: H3 chondrite
Macroscopic Description: Roberta Score Smooth brown fusion crust covers 90% of this unequilibrated chondrite. Large areas of oxidation are present in the clast-rich, dark-gray matrix. Evaporite deposit was noted.
Thin Section (,4) Description: Brian Mason, The section shows a close-packed aggregate of chondrules and chondrule fragments, up to 1.8 mm across; most of the chondrules are granular or porphyritic olivine and olivine-pyroxene, but a few radiating and cryptocrystalline pyroxene chondrules are present. They are set in a small amount of dark matrix which contains some nickel-iron and troilite, often concentrated as rims to the chondrules. Microprobe analyses show olivine and pyroxene of variable composition: olivine, Fa3-19 (CV FeO is 38); pyroxene, Fs6-13. The variability of olivine and pyroxene compositions indicates type 3, and the amount of metal suggests H group; hence the meteorite is tentatively classified as an H3 chondrite (estimated H3.6). | ||||||||||||||||||||
| Data from: MB76 Table 2 Line 4722: |
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| References: | Published in Antarctic Meteorite Newsletter 13(2) (1990), 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 40719 approved meteorites from Antarctica (plus 4494 unapproved names) | ||||||||||||||||||||