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MacAlpine Hills 88174
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:help 98.4 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 13(2)  (1990)  H3
Meteoritical Bulletin:  MB 76  (1994)  H3.5
NHM Catalogue:  5th Edition  (2000)  H3.5
MetBase:  v. 7.1  (2006)  H3.5
Recommended:  H3.5    [explanation]

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
Writeuphelp
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:
Mass (g):98.4
Class:H3.5
Weathering grade:Be
Fayalite (mol%):3-19
Ferrosilite (mol%):6-13
Catalogs:
Search for specimens in the Smithsonian Institution collection (U.S.):   
    Require SI photo
Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 13(2) (1990), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
Find references in NASA ADS:
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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (84° 13'S, 160° 30'E)
     Recommended::   Unknown

Statistics:
     This is 1 of 40129 approved meteorites from Antarctica (plus 4494 unapproved names)

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