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Allan Hills 85070
Basic information Name: Allan Hills 85070
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 85070
Observed fall: No
Year found: 1985
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 12.9 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 11(2)  (1988)  L3
Meteoritical Bulletin:  MB 76  (1994)  L3.6
NHM Catalogue:  5th Edition  (2000)  L3.6
MetBase:  v. 7.1  (2006)  L3.6
Recommended:  L3.6    [explanation]

This is 1 of 57 approved meteorites classified as L3.6.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Writeuphelp
Writeup from AMN 11(2):

Sample No.: ALH85070

Location: Allan Hills

Weight (g): 12.9

Field No.: 2231

Dimensions (cm): 3 x 2.5 x 1.5

Meteorite Type: L3 Chondrite

 

Macroscopic Description: Roberta Score,

Fusion crust covers about 75% of this stone. The interior is light-gray and has abundant inclusions. Oxidation is light.

 

Thin Section (,3) Description: Brian Mason

The section shows abundant chondrules and chondrule fragments, up to 2 mm across, in a fine-grained matrix containing a few coarser grains of nickel-iron and troilite. A variety of chondrule types is present including granular and porphyritic olivine and olivine-pyroxene, barred olivine and crypto-crystalline pyroxene. Much of the pyroxene is polysynthetically twinned clinobronzite. Minor weathering is indicated by rusty halos around metal grains. Microprobe analyses show olivine and pyroxene of variable composition: olivine, Fa4-25, mean Fa18 (CV FeO is 38) ; pyroxene, Fs1-29. The small amount of nickel-iron suggests L group, and the variability of olivine and pyroxene compositions type 3; hence the meteorite is classified as an L3 chondrite (estimated L3.6).

Data from:
  MB76
  Table 2
  Line 1299:
Origin or pseudonym:Far Western
Mass (g):12.9
Class:L3.6
Weathering grade:A/B
Fayalite (mol%):4-25
Ferrosilite (mol%):1-29
Comments:NTL=104±2
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 11(2) (1988), 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° 50' 18"S, 156° 20' 13"E)
Note: the NHM and MetBase coordinates are 86.1 km apart

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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