Meteoritical Bulletin: Entry for Allan Hills 85106

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Allan Hills 85106

Basic information

Name: Allan Hills 85106
This is an OFFICIAL meteorite name.
Abbreviation: ALH 85106
Observed fall: No
Year found: 1985
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 2.7 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 10(2)	(1987)	C2
Meteoritical Bulletin:	MB 76	(1994)	C2
NHM Catalogue:	5th Edition	(2000)	CM2
MetBase:	v. 7.1	(2006)	CM2
Antarctic Meteorite Newsletter:	AMN 31(1)	(2008)	CM2
Recommended:			CM2 [explanation]

This is 1 of 636 approved meteorites classified as CM2. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites

Writeup

Writeup from AMN 10(2):

Sample No.: ALH85106

Location: Allan Hills

Weight (g): 2.7

Field No.: 2650

Dimensions (cm): 1.5 x 1.5 x 1.5

Meteorite Type: C2 Chondrite

Macroscopic Description: Roberta Score

The overall color of this weathered carbonaceous chondrite is greenish-gray. This greenish weathering extends 2 mm into the interior. The core of this stone is black and contains small white inclusions.

Thin Section (,2) Description: Brian Mason

The section shows silicate grains, irregular aggregates, and rare chondrules in a translucent to opaque matrix. Nickel-iron and sulfide are present in trace amounts. Microprobe analyses show olivine of variable composition - many grains are near Fa1, but the range is Fa0.3-30; pyroxene is rare. The meteorite is a C2 chondrite.

Data from:
  MB76
  Table 2
  Line 1335:

Origin or pseudonym:	Far Western
Mass (g):	2.7
Class:	C2
Weathering grade:	B
Fayalite (mol%):	0.3-30

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 10(2) (1987), 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° 54' 38"S, 156° 32' 5"E)

Note: the NHM and MetBase coordinates are 82.7 km apart

Statistics:
This is 1 of 44543 approved meteorites from Antarctica (plus 3802 unapproved names)

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Revision
history:

This lists important revisions made to data for this record.

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