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Allan Hills A77223
Basic information Name: Allan Hills A77223
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77223
This meteorite may also be called Allan Hills 77223 (ALH 77223) in publications.

Observed fall: No
Year found: 1977 or 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 208 g
Antarctic Meteorite Newsletter:  AMN 3(1)  (1980)  H4
Meteoritical Bulletin:  MB 76  (1994)  H4
NHM Catalogue:  5th Edition  (2000)  H4
NIPR Catalogue:  2000 Edition  (2000)  H4
MetBase:  v. 7.1  (2006)  H4
Recommended:  H4    [explanation]

This is 1 of 6388 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeup from AMN 3(1):
This text was reprinted from AMN 3(1) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA77223

Location: Allan Hills

Field No.: 78012505

Weight (gms): 207.9

Meteorite Type: H4 Chondrite


Physical Description:

The T surface of this specimen has patches of dull black fusion crust. The remainder of the sample is stained reddish brown by iron oxidation. The surfaces devoid of fusion crust are fracture surfaces. Several cracks penetrate the sample.


Petrographic Description: Brian Mason

Chondritic structure is well developed; chondrules range from 0.2-1.5 mm in diameter, and are of the usual types, the commonest being barred olivine, granular olivine and olivine-pyroxene, and fine-grained pyroxene. The groundmass consists of fine -grained olivine and pyroxene, with minor amounts of nickel-iron and troilite (nickel-iron in excess of troilite). Some of the pyroxene is polysynthetically twinned clinobronzite. The section is extensively veined with red-brown limonite. Microprobe analyses show, olivine of uniform composition (Fa17), and pyroxene of somewhat variable composition (Fs15-Fs23, average Fs17); some analyzed spots within pyroxene grains showed CaO contents up to 15%, suggesting exsolution of diopsidic pyroxene. The meteorite is classified as an H4 chondrite.

Data from:
  Table 2
  Line 179:
Origin or pseudonym:Near Western
Mass (g):207.9
Weathering grade:C
Fayalite (mol%):17
Ferrosilite (mol%):15-23
Comments:26Al=56±2; 77004 pairing group
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References: Published in Antarctic Meteorite Newsletter 3(1) (1980), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 43'S, 159° 40'E)

     This is 1 of 43699 approved meteorites from Antarctica (plus 3802 unapproved names)
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