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O'Malley 004
Basic information Name: O'Malley 004
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2011
Country: Australia
Mass:help 19 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  LL6
Recommended:  LL6    [explanation]

This is 1 of 2801 approved meteorites (plus 1 unapproved name) classified as LL6.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 23 Feb 2012
Writeuphelp
Writeup from MB 100:

O’Malley 004        30°37’29.0"S, 131°28’14.3"E

South Australia, Australia

Found: 7 Apr 2011

Classification: Ordinary chondrite (LL6)

History: Single piece found by A. Tomkins on the Nullarbor plain.

Physical characteristics: Flat dark greenish stone shows ~30% pitted remnant fusion crust.

Petrography: (A. Tait, Monash). A transparent microcrystalline recrystallized matrix dominates the sample; matrix grains are dominantly small. Chondrules have been heavily equilibrated with the surrounding matrix resulting in diffuse chondrule edges. Chondrule populations include; BO, PO, RP. Plagioclase grains have been transformed to maskelynite and range in size from (~50-100 μm). Olivine show mosaicism, undulose extinction and shock lamellae. Opaque shock-fracture networks cross-cut the sample, and melt pockets also exist. This sample has minor terrestrial weathering, except for oxidation of some larger troilite crystals.

Geochemistry: (A. Tait, Monash) Microprobe analyses show that olivine and pyroxene compositions are uniform: olivine Fa31.4-32.0, mean=31.74 mol%, std=0.27, n=4; Low-Ca pyroxene Fs25.5-26.4, mean=26.04 mol%, std=0.47, n=3.

Classification: Ordinary Chondrite (LL6, S5, W1).

Data from:
  MB100
  Table 1
  Line 1713:
State/Prov/County:South Australia
Origin or pseudonym:Nullarbor Plain
Date:7 Apr 2011
Latitude:30°37'29.0"S
Longitude:131°28'14.3"E
Mass (g):19
Pieces:1
Class:LL6
Shock stage:S5
Weathering grade:W1
Fayalite (mol%):31.74
Ferrosilite (mol%):26.04
Wollastonite (mol%):2.12
Classifier:A.W. Tait
Type spec mass (g):9.7
Type spec location:Monash
Main mass:Monash
Finder:A.Tomkins
Comments:Submitted by A. Tomkins, E. Mare, A. Tait, A. Langendam
Institutions
   and collections
Monash: Building 28 School of Geosciences Monash University Victoria 3800 Australia, Australia (institutional address; updated 12 Dec 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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Geography:

Australia
Coordinates:
     Recommended::   (30° 37' 29"S, 131° 28' 14"E)

Statistics:
     This is 1 of 238 approved meteorites from South Australia, Australia (plus 2 unapproved names) (plus 4 impact craters)
     This is 1 of 714 approved meteorites from Australia (plus 45 unapproved names) (plus 27 impact craters)
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