Meteoritical Bulletin: Entry for Allan Hills A81032

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Allan Hills A81032

Basic information

Name: Allan Hills A81032
This is an OFFICIAL meteorite name.
Abbreviation: ALHA81032
This meteorite may also be called Allan Hills 81032 (ALH 81032) in publications.
Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 727 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 6(1)	(1983)	LL3
	AMN 7(1)	(1984)	L3
Meteoritical Bulletin:	MB 76	(1994)	L3.4
NHM Catalogue:	5th Edition	(2000)	L3.4
MetBase:	v. 7.1	(2006)	L3.4
Recommended:			L3.4 [explanation]

This is 1 of 51 approved meteorites classified as L3.4. [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Writeup

Writeup from AMN 6(1):

Sample No.: ALHA81032

Location: Allan Hills

Field No.: 1686

Weight (gms): 726.8

Meteorite Type: LL3 Chondrite

Physical Description: Carol Schwarz

This angular specimen has thin patchy fusion crust. Where devoid of fusion crust clasts or chondrules up to 0.5 cm are visible in the weathered matrix. Chipping revealed no fresh material. Dimensions: 9 x 9 x 6 cm.

Petrographic Description: Brian Mason

This specimen closely resembles ALHA81025 in texture, range of mineral compositions, and degree of weathering. The mean compositions of olivine (Fa15) and pyroxene (Fs11) are somewhat lower, but this is probably due to the inclusion of several grains of almost iron-free forsterite and enstatite. It is therefore classified as an LL3 chondrite and tentatively paired with that meteorite.

Data from:
  MB76
  Table 2
  Line 555:

Origin or pseudonym:	Main icefield
Mass (g):	726.8
Class:	L3.4
Weathering grade:	C
Fayalite (mol%):	0-42
Ferrosilite (mol%):	2-14
Comments:	26Al=45±2; 77011 pairing group

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 6(1) (1983), 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° 41' 53"S, 159° 23' 15"E)

Note: the NHM and MetBase coordinates are 7.5 km apart

Statistics:
This is 1 of 43856 approved meteorites from Antarctica (plus 3802 unapproved names)

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