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O'Malley 016
Basic information Name: O'Malley 016
     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 17.5 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  H4
Recommended:  H4    [explanation]

This is 1 of 6484 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 23 Feb 2012
Writeuphelp
Writeup from MB 100:

O’Malley 016        30°32’24.7"S, 131°15’18.3"E

South Australia, Australia

Found: 10 Apr 2011

Classification: Ordinary chondrite (H4)

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

Physical characteristics: Dark reddish brown stone, ~60% fusion crusted.

Petrography: (A. Tait, Monash) A finely recrystallized matrix surrounds well-defined chondrules, although the matrix is difficult to distinguish due to weathering. Plagioclase is absent across most of the sample, although a few small (<5 μm) grains were found. Chondrule populations include BO, RP, and PO. Most olivine grains have undulose extinction, but no shock lamellae. The sample is extensively oxidized; Fe-Ni metal is almost completely destroyed.

Geochemistry: (A. Tait, Monash) Microprobe analyses show that olivine and pyroxene compositions are uniform: olivine Fa19.3-19.7, mean=19.47 mol%, std=0.19, n=4; Low-Ca pyroxene Fs16.8-17.2, mean=16.99 mol%, std=0.21, n=4.

Classification: Ordinary Chondrite (H4, S2, W4).

Data from:
  MB100
  Table 1
  Line 1725:
State/Prov/County:South Australia
Origin or pseudonym:Nullarbor Plain
Date:10 Apr 2011
Latitude:30°32'24.7"S
Longitude:131°15'18.3"E
Mass (g):17.5
Pieces:1
Class:H4
Shock stage:S2
Weathering grade:W4
Fayalite (mol%):19.47
Ferrosilite (mol%):16.99
Wollastonite (mol%):1.18
Classifier:A.W. Tait
Type spec mass (g):12.8
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° 32' 25"S, 131° 15' 18"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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