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O'Malley 019
Basic information Name: O'Malley 019
     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 786 g
Meteoritical Bulletin:  MB 100  (2012)  L6
Recommended:  L6    [explanation]

This is 1 of 11997 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 Feb 2012
Writeup from MB 100:

O’Malley 019        30°58’49.3"S, 131°20’40.4"E

South Australia, Australia

Found: 11 Apr 2011

Classification: Ordinary chondrite (L6)

History: After an initial broken fragment was found by A. Langendam, a further 105 fragments were recovered in a 300 m2 area by the search team, mostly from within a 25 m2 area.

Physical characteristics: Fragments with no remnant fusion crust, some with extensive lichen covering.

Petrography: (A. Tait, Monash) Matrix is transparent and strongly recrystallized. Chondrules edges are diffuse. Chondrules vary significantly in size and composition; varieties include CO, RP, BO, PO, POP. Large plagioclase grains (> 40 μm) are common. Metal grains are larger than troilite, with an average size of ~400 μm; troilite has an average grain size of ~100 μm. Troilite is more abundant than metal. Pyroxenes and olivine have undulose extinction. Fe-Ni metal grains are ~20% oxidised.

Geochemistry: (A. Tait, Monash) Microprobe analyses show that olivine and pyroxene compositions are uniform: olivine Fa25.5-25.9, mean=25.76 mol%, std=0.21, n=4; Low-Ca pyroxene Fs22.0-23.0, mean=22.35 mol%, std=0.47, n=4.

Classification: Ordinary Chondrite (L6, S2, W2).

Data from:
  Table 1
  Line 1728:
State/Prov/County:South Australia
Origin or pseudonym:Nullarbor Plain
Date:11 Apr 2011
Mass (g):786.3
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):25.76
Ferrosilite (mol%):22.35
Wollastonite (mol%):1.36
Classifier:A.W. Tait
Type spec mass (g):772.8
Type spec location:Monash
Main mass:Monash
Finder:A. Langendam
Comments:Submitted by A. Tomkins, E. Mare, A. Tait, A. Langendam
   and collections
Monash: Building 28 School of Geosciences Monash University Victoria 3800 Australia, Australia (institutional address; updated 12 Dec 2012)
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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     Recommended::   (30° 58' 49"S, 131° 20' 40"E)

     This is 1 of 239 approved meteorites from South Australia, Australia (plus 3 unapproved names) (plus 4 impact craters)
     This is 1 of 716 approved meteorites from Australia (plus 46 unapproved names) (plus 27 impact craters)
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