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O'Malley 018
Basic information Name: O'Malley 018
     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 105.2 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  H4
Recommended:  H4    [explanation]

This is 1 of 6000 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 018        30°59’16.4"S, 131°20’26.4"E

South Australia, Australia

Found: 11 Apr 2011

Classification: Ordinary chondrite (H4)

History: Four broken fragments were found within a 400 m2 area of clay pans by A Tomkins.

Physical characteristics: Weathered with minor remnant fusion crust.

Petrography: (A. Tait, Monash) Chondrules well defined and well-sorted with an average diameter of ~600 μm. The matrix is fine grained and difficult to distinguish due to weathering; there is no matrix plagioclase. Chondrules types include BO, C, PO, RP. Olivine has sharp extinction. Metal grains have been completely oxidized; troilite remains and is variably weathered.

Geochemistry: (A. Tait, Monash) Microprobe analyses show that olivine and pyroxene compositions are uniform: olivine Fa18.4-19.0, mean=18.79 mol%, std=0.20, n=9; Low-Ca pyroxene Fs16.3-17.3, mean=16.68 mol%, std=0.40, n=5.

Classification: Ordinary Chondrite (H4, S1, W4).

Data from:
  MB100
  Table 1
  Line 1727:
State/Prov/County:South Australia
Origin or pseudonym:Nullarbor Plain
Date:11 Apr 2011
Latitude:30°59'16.4"S
Longitude:131°20'26.4"E
Mass (g):105.2
Pieces:4
Class:H4
Shock stage:S1
Weathering grade:W4
Fayalite (mol%):18.79
Ferrosilite (mol%):16.68
Wollastonite (mol%):1.02
Classifier:A.W. Tait
Type spec mass (g):91.7
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° 59' 16"S, 131° 20' 26"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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