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Allan Hills 84205
Basic information Name: Allan Hills 84205
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 84205
Observed fall: No
Year found: 1984
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 25.2 g
Antarctic Meteorite Newsletter:  AMN 11(1)  (1988)  L3
Meteoritical Bulletin:  MB 76  (1994)  L3.9
NHM Catalogue:  5th Edition  (2000)  L3.9
MetBase:  v. 7.1  (2006)  L3.9
Recommended:  L3.9    [explanation]

This is 1 of 29 approved meteorites classified as L3.9.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Writeup from AMN 11(1):

Sample No.: ALH84205

Location: Allan Hills

Weight (g): 25.2

Field No.: 2830

Dimensions (cm): 3x2.5x2

Meteorite Type: L3 Chondrite


Macroscopic Description: Roberta Score.

Fusion crust covers 501 of ALH84205. The interior is made up of light to medium gray matrix with abundant light and dark inclusions/chondrules.


Thin Section (,2) Description: Brian Mason

Chondrules and chondrule fragments are abundant, ranging up to 2.1 mm across; most are granular olivine and olivine-pyroxene, but barred olivine and cryptocrystalline pyroxene chondrules are also present. Man; have narrow black rims. Nickel-iron and troilite are present in small amounts. Microprobe analyses show olivine ranging in composition from Fa12 to Fa33, with a mean of Fa19 (CV FeO is 27); pyroxene composition ranges from Fs4 to Fs19. The meteorite is classified as an L3 chondrite (estimated L3.7).

Data from:
  Table 2
  Line 1170:
Origin or pseudonym:Far Western
Mass (g):25.2
Weathering grade:B
Fayalite (mol%):12-33
Ferrosilite (mol%):4-19
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References: Published in Antarctic Meteorite Newsletter 11(1) (1988), 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° 53' 25"S, 156° 59' 42"E)
Note: the NHM and MetBase coordinates are 70.8 km apart

     This is 1 of 43700 approved meteorites from Antarctica (plus 3802 unapproved names)
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