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O'Malley 002
Basic information Name: O'Malley 002
     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 4.6 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  L5
Recommended:  L5    [explanation]

This is 1 of 6528 approved meteorites (plus 4 unapproved names) classified as L5.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 23 Feb 2012
Writeuphelp
Writeup from MB 100:

O’Malley 002        30°59’35.2"S, 131°19’57.1"E

South Australia, Australia

Found: 6 Apr 2011

Classification: Ordinary chondrite (L5)

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

Physical characteristics: Dark reddish-brown stone, ~70% fusion crusted with weathered broken surfaces.

Petrography: (A. Tait, Monash). Indistinct chondrule populations include; PO, RP and BO. The matrix has been recrystalized and is transparent. Olivine recrystallised and anhedral, plagioclase is typically > 50 μm. Metal grains and sulfides have almost been completely oxidized. Olivine has undulose extinction, and no shock lamellae. The sample has many melt pockets, and a series of melt networks cross cut the entire sample.

Geochemistry: (A.Tait, Monash) Microprobe analyses show that olivine and pyroxene compositions are uniform: olivine Fa24.8-25.3, mean=25.03 mol%, std=0.29, n=4; Low-Ca pyroxene Fs19.9-20.8, mean=20.47 mol %, std=0.40, n=4.

Classification: Ordinary Chondrite (L5, S4, W3).

Data from:
  MB100
  Table 1
  Line 1711:
State/Prov/County:South Australia
Origin or pseudonym:Nullarbor Plain
Date:6 Apr 2011
Latitude:30°59'35.2"S
Longitude:131°19'57.1"E
Mass (g):4.6
Pieces:1
Class:L5
Shock stage:S4
Weathering grade:W3
Fayalite (mol%):25.03
Ferrosilite (mol%):20.47
Wollastonite (mol%):1.32
Classifier:A.W. Tait
Type spec mass (g):3.3
Type spec location:Monash
Main mass:Monash
Finder:A. Tait
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° 59' 35"S, 131° 19' 57"E)

Statistics:
     This is 1 of 232 approved meteorites from South Australia, Australia (plus 3 unapproved names) (plus 4 impact craters)
     This is 1 of 702 approved meteorites from Australia (plus 46 unapproved names) (plus 27 impact craters)
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