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O'Malley 012
Basic information Name: O'Malley 012
     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 14.1 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  L4
Recommended:  L4    [explanation]

This is 1 of 1709 approved meteorites (plus 4 unapproved names) classified as L4.   [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 012        30°53’34.1"S, 131°23’29.1"E

South Australia, Australia

Found: 9 Apr 2011

Classification: Ordinary chondrite (L4)

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

Physical characteristics: Flatish dark brown stone with ~30% fusion crust.

Petrography: (A. Tait, Monash) Large variety of well-sorted and well-defined chondrules including; GOP, CP, BO, POP and RP, all of which were on the order of 900 μm in diameter. Matrix is transparent and recrystallized. Plagioclase is very fine grained. Olivine grains show extensive undulose extinction. Troilite and Fe-Ni metal are extensively weathered; few metal grains remain.

Geochemistry: (A. Tait, Monash) Microprobe analyses show that olivine and pyroxene compositions are uniform: olivine Fa22.3-22.8, mean=22.59 mol%, std=0.25, n=4; Low-Ca pyroxene Fs19.5-20.4, mean=20.01 mol%, std=0.38, n=5.

Classification: Ordinary Chondrite (L4, S2, W3).

Data from:
  MB100
  Table 1
  Line 1721:
State/Prov/County:South Australia
Origin or pseudonym:Nullarbor Plain
Date:9 Apr 2011
Latitude:30°53'34.1"S
Longitude:131°23'29.1"E
Mass (g):14.1
Pieces:1
Class:L4
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):22.59
Ferrosilite (mol%):20.01
Wollastonite (mol%):1.10
Classifier:A.W. Tait
Type spec mass (g):10.6
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' 34"S, 131° 23' 29"E)

Statistics:
     This is 1 of 238 approved meteorites from South Australia, Australia (plus 2 unapproved names) (plus 4 impact craters)
     This is 1 of 714 approved meteorites from Australia (plus 45 unapproved names) (plus 27 impact craters)
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