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Allan Hills A78188
Basic information Name: Allan Hills A78188
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78188
This meteorite may also be called Allan Hills 78188 (ALH 78188) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 0.9 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 4(1)  (1981)  L3
Meteoritical Bulletin:  MB 76  (1994)  L3
NHM Catalogue:  5th Edition  (2000)  L3
MetBase:  v. 7.1  (2006)  L3.5
Recommended:  L3.5    [explanation]

This is 1 of 95 approved meteorites classified as L3.5.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Writeuphelp
Writeup from AMN 4(1):

Sample No.: ALHA78188

Location: Allan Hills

Field No.: 040

Weight (gms): 0.87

Meteorite Type: L3 Chondrite

 

Physical Description:

No fusion crust remains on this reddish-brown totally weathered sample.

 

Petrographic Description: Brian Mason

The meteorite consists of a close-packed aggregate of chondrules, 0.3-1.2 mm across, with a relatively small amount of matrix. Porphyritic olivine chondrule contain intergranular glass, some of which is transparent brown but much is turbid from partial devitrification. Other chondrules consist of granular olivine and polysynthetically-twinned low-Ca clinopyroxene. Many chondrules have dark rims consisting largely of troilite. A little nickel-iron is present. Weathering is extensive, with veins and patches of brown limonite throughout the section. Microprobe analyses show variable composition for both olivine and pyroxene; olivine, Fa1-34, average Fa15; pyroxene, Fs5-29, average Fs17. The variability in olivine and pyroxene composition indicates type 3, and the low metal content suggest L group, so the meteorite is tentatively classified an L3 chondrite.

Data from:
  MB76
  Table 2
  Line 396:
Origin or pseudonym:Main icefield
Mass (g):0.9
Class:L3
Weathering grade:C
Fayalite (mol%):1-34
Ferrosilite (mol%):5-29
Comments:77011 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 4(1) (1981), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 43'S, 159° 40'E)

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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