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Allan Hills A77033
Basic information Name: Allan Hills A77033
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77033
This meteorite may also be called Allan Hills 77033 (ALH 77033) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 9.3 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 1(2)  (1978)  LL3
AMN 4(1)  (1981)  L3
Meteoritical Bulletin:  MB 76  (1994)  L3
NHM Catalogue:  5th Edition  (2000)  L3
NIPR Catalogue:  2000 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.: ALHA77033

Location: Allan Hills

Field No.: 77122734

Weight (gms): 9.34

Meteorite Type: L3 Chondrite

 

Physical Description:

Specimen is angular, rough and dark brown. Exterior surfaces do not appear to have fusion crust, but are highly weathered. The stone chipped easily, revealing a highly oxidized broken face. Maximum overall length is ~3.0 cm.

 

Petrographic Description: Brian Mason

The section shows a closely packed mass of chondrules (0.3-1.1 mm diameter) and irregular crystalline aggregates, with a little interstitial nickel-iron and troilite (1-2% of each) and a relatively small amount of fine-grained matrix. A considerable variety of chondrules is present, the commonest being granular olivine and olivine/polysynthetically-twinned clinopyroxene, porphyritic olivine, and fine-grained pyroxene. Some chondrules have intergranular transparent pale brown glass, in others the glass is turbid and partly devitrified. Yellow-brown limonitic staining pervades the section, and patches and veinlets of red-brown limonite are common. Microprobe analyses show olivine ranging in composition from Fa8 to Fa38, with a mean of Fa18; the pyroxene is relatively uniform in iron content (Fs8-9) but shows a considerable range in calcium (Wo0.3-8.5). The low content of nickel-iron and troilite suggest L group, and the meteorite is classified L3.

Data from:
  MB76
  Table 2
  Line 36:
Origin or pseudonym:Main icefield
Mass (g):9.3
Class:L3
Weathering grade:C
Fayalite (mol%):8-38
Ferrosilite (mol%):8-9
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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