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O'Malley 011
Basic information Name: O'Malley 011
     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 33.6 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  L6
Recommended:  L6    [explanation]

This is 1 of 12727 approved meteorites (plus 11 unapproved names) classified as L6.   [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 011        30°53’36.4"S, 131°23’24.0"E

South Australia, Australia

Found: 9 Apr 2011

Classification: Ordinary chondrite (L6)

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

Physical characteristics: Rounded oblong stone covered by fusion crust.

Petrography: (A. Tait, Monash) Transparent matrix and subhedral olivine grains. Chondrules edges are diffuse and poorly defined. Chondrule populations include; BO, PO. Plagioclase is dominantly <100 μm. Troilite (typically <150 μm) is more abundant than Fe-Ni metal grains (in a ratio of 10:1). The largest metal grains are <300 μm. Olivine has sharp extinction. Weathering of metal grains and troilite is not complete.

Geochemistry: (A. Tait, Monash) Microprobe analyses show that olivine and pyroxene compositions are uniform: olivine Fa24.8-25.5, mean=25.25 mol%, std=0.31, n=4; Low-Ca pyroxene Fs21.4-21.7, mean=21.56 mol%, std=0.11, n=4.

Classification: Ordinary Chondrite (L6, S1, W2).

Data from:
  MB100
  Table 1
  Line 1720:
State/Prov/County:South Australia
Origin or pseudonym:Nullarbor Plain
Date:9 Apr 2011
Latitude:30°53'36.4"S
Longitude:131°23'24.0"E
Mass (g):33.6
Pieces:1
Class:L6
Shock stage:S1
Weathering grade:W2
Fayalite (mol%):25.25
Ferrosilite (mol%):21.56
Wollastonite (mol%):1.59
Classifier:A.W. Tait
Type spec mass (g):28.4
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° 53' 36"S, 131° 23' 24"E)

Statistics:
     This is 1 of 241 approved meteorites from South Australia, Australia (plus 3 unapproved names) (plus 4 impact craters)
     This is 1 of 719 approved meteorites from Australia (plus 11 unapproved names) (plus 27 impact craters)
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Revision
  history:
  This lists important revisions made to data for this record.

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