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O'Malley 023
Basic information Name: O'Malley 023
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2012
Country: Australia
Mass:help 17.8 g
Classification
  history:
Meteoritical Bulletin:  MB 108  (2020)  L6
Recommended:  L6    [explanation]

This is 1 of 11574 approved meteorites (plus 6 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 Jan 2019
Writeuphelp
Writeup from MB 108:

O’Malley 023        30°38’57.7"S, 131°28’20.2"E

South Australia, Australia

Find: 17 May 2012

Classification: Ordinary chondrite (L6)

History: Two adjacent pieces found by A. Tomkins amongst limestone gravel

Physical characteristics: Two fragments with smooth brown-black fusion crust, covering 70% of the larger sample.

Petrography: (L. Bowlt) Poorly defined fragmented chondrules, ranging in size up to 2 mm, sit in a strongly recrystallized matrix. Mineralogy includes olivine, pyroxene, plagioclase, troilite, Fe-Ni metal and chromite. Chondrule types include BO, GOP and PO. Plagioclase is very coarse grained with sizes commonly in the range of 80 μm. Olivine grains show mosaicism and shock lamellae. Plagioclase is partly converted to maskelynite and there are shock melt veins. Incomplete transformation of plagioclase to maskelynite suggests shock classification of S4. 20-30% of FeNi metal and troilite are weathered with thin oxide rims.

Geochemistry: (L. Bowlt, Monash) Microprobe analyses show that olivine and pyroxene compositions are uniform: olivine Fa22.2-22.9, mean= Fa22.5, std=0.31, n=5; Low-Ca pyroxene Fs18.6-19.7 , mean= Fa19.3, std=0.55 , n=5.

Classification: Ordinary Chondrite (L6, S4, W3)

Data from:
  MB108
  Table 0
  Line 0:
State/Prov/County:South Australia
Origin or pseudonym:Nullarbor Plain
Date:17 May 2012
Latitude:30°38'57.7"S
Longitude:131°28'20.2"E
Mass (g):17.8
Pieces:2
Class:L6
Shock stage:S4
Weathering grade:W2
Fayalite (mol%):22.5
Ferrosilite (mol%):19.3
Wollastonite (mol%):1.6
Classifier:L. J. Bowlt, Monash
Type spec mass (g):15.6
Type spec location:Monash
Main mass:Monash
Finder:A. Tomkins
Comments:Submitted by A. Tomkins
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. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Geography:

Australia
Coordinates:
     Recommended::   (30° 38' 58"S, 131° 28' 20"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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