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O'Malley 009
Basic information Name: O'Malley 009
     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 8.4 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  H4
Recommended:  H4    [explanation]

This is 1 of 6033 approved meteorites (plus 11 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 009        30°56’1.8"S, 131°21’42.1"E

South Australia, Australia

Found: 9 Apr 2011

Classification: Ordinary chondrite (H4)

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

Physical characteristics: Dark brown stone, rounded, lacking fusion crust.

Petrography: (A. Tait, Monash) Larger chondrules have distinct grain boundaries, although they are somewhat obscured by iron oxide from weathering coating grain boundaries. Chondrule populations include; GOP, RP, POP, PO. Plagioclase grains are 2-50 microns. Olivine has sharp extinction and no shock lamellae. Weathering has oxidized all the Fe-Ni metal grains and much of the troilite. Troilite grains are (~150 μm) in diameter. Small (< 20 μm) metal grains reside in chondrules that protected them from weathering.

Geochemistry: (A. Tait, Monash) Microprobe analyses show that olivine and pyroxene compositions are uniform: olivine Fa18.6-20.6, mean=19.30 mol%, std=0.92, n=4; Low-Ca pyroxene Fs17.0-17.4, mean=17.18 mol%, std=0.17, n=4.

Classification: Ordinary Chondrite (H4, S1, W3).

Data from:
  MB100
  Table 1
  Line 1718:
State/Prov/County:South Australia
Origin or pseudonym:Nullarbor Plain
Date:9 Apr 2011
Latitude:30°56'1.8"S
Longitude:131°21'42.1"E
Mass (g):8.4
Pieces:1
Class:H4
Shock stage:S1
Weathering grade:W3
Fayalite (mol%):19.30
Ferrosilite (mol%):17.18
Wollastonite (mol%):1.51
Classifier:A.W. Tait
Type spec mass (g):5.8
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° 56' 2"S, 131° 21' 42"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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