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O'Malley 010
Basic information Name: O'Malley 010
     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 52.9 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  L5
Recommended:  L5    [explanation]

This is 1 of 7176 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 010        30°56’03.0"S, 131°21’40"E

South Australia, Australia

Found: 9 Apr 2011

Classification: Ordinary chondrite (L5)

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

Physical characteristics: Single rounded dark-brown stone with ~40% pitted and broken fusion crust.

Petrography: (A. Tait, Monash) The matrix has been recrystallized and chondrule edges are indistinct. Subhedral olivine grains are up to 300 μm. Relict chondrule populations include; BO, CP, RP, PO. Plagioclase is readily discernible by reflected light. A third of olivine grains show undulose extinction, and some have shock lamellae. Metal grains and sulfides have been oxidized in uneven pockets throughout the sample, with an overall moderate amount of oxidation.

Geochemistry: (A. Tait, Monash) Microprobe analyses show that olivine and pyroxene compositions are uniform: olivine Fa24.7-25.4, mean=25.08 mol%, std=0.31, n=4; Low-Ca pyroxene Fs21.2-21.8, mean=21.49 mol%, std=0.21, n=5.

Classification: Ordinary Chondrite (L5, S2, W2).

Data from:
  MB100
  Table 1
  Line 1719:
State/Prov/County:South Australia
Origin or pseudonym:Nullarbor Plain
Date:9 Apr 2011
Latitude:30°56'03.0"S
Longitude:131°21'40"E
Mass (g):52.9
Pieces:1
Class:L5
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):25.08
Ferrosilite (mol%):21.49
Wollastonite (mol%):1.26
Classifier:A.W. Tait
Type spec mass (g):46.5
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° 56' 3"S, 131° 21' 40"E)

Statistics:
     This is 1 of 239 approved meteorites from South Australia, Australia (plus 2 unapproved names) (plus 4 impact craters)
     This is 1 of 715 approved meteorites from Australia (plus 45 unapproved names) (plus 27 impact craters)
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