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Allan Hills A77258
Basic information Name: Allan Hills A77258
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77258
This meteorite may also be called Allan Hills 77258 (ALH 77258) in publications.

Observed fall: No
Year found: 1977 or 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 597 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 2(1)  (1979)  H6
Meteoritical Bulletin:  MB 76  (1994)  H6
NHM Catalogue:  5th Edition  (2000)  H6
MetBase:  v. 7.1  (2006)  H6
Recommended:  H6    [explanation]

This is 1 of 5855 approved meteorites (plus 5 unapproved names) classified as H6.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeuphelp
Writeup from AMN 2(1):
This text was reprinted from AMN 2(1) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA77258

Location: Allan Hills

Field No.: B78010303

Weight (gms): 597.3

Meteorite Type: H6 Chondrite

 

Physical Description:

This is a five sided specimen that is covered with polygonally fractured fusion crust. One small area has been stained by iron oxidation. The sample is ~10.0x9.0x5.0 cm. Sawing the sample in half reveals that the fusion crust is <0.5 mm thick and the sample has no weathering rind. Metallic particles are visible in the yellowish-brown matrix. The matrix material appears to be very porous.

 

Petrographic Description: Brian Mason

In the section chondrules are sparse and poorly defined, merging with the granular groundmass, which consists of olivine and orthopyroxene with minor amounts of nickel-iron, troilite, and plagioclase. The section is moderately stained with brown limonite. Fusion crust is present along one edge. Microprobe analyses show olivine (Fa18), orthopyroxene (Fs16), and plagioclase (An13) of uniform composition; a little diopside (Wo47En47Fs6) occurs in association with orthopyroxene. The meteorite is classified as an H6 chondrite.

Data from:
  MB76
  Table 2
  Line 209:
Origin or pseudonym:Main icefield
Mass (g):597.3
Class:H6
Weathering grade:B/Ce
Fayalite (mol%):18
Ferrosilite (mol%):16
Comments:26Al=29±2; NTL=48±1
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 2(1) (1979), 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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