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O'Malley 024
Basic information Name: O'Malley 024
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2015
Country: Australia
Mass:help 8.8 g
Classification
  history:
Meteoritical Bulletin:  MB 108  (2020)  H6
Recommended:  H6    [explanation]

This is 1 of 6153 approved meteorites (plus 5 unapproved names) classified as H6.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 23 Jan 2019
Writeuphelp
Writeup from MB 108:

O’Malley 024        30°41’28.7"S, 131°03’38.2"E

South Australia, Australia

Find: 8 Apr 2015

Classification: Ordinary chondrite (H6)

History: Two jig-saw fitting pieces found by A. Tait

Physical characteristics: Two fragments representing 60% of the total stone.

Petrography: (S. Alkemade, Monash) Chondrules (0.2 - 1.0 mm diameter) have indistinct edges, in a strongly recrystallized matrix. Relict chondrules types include BO, RP, POP, cryptocrystalline and poikilitic. Mineralogy includes olivine, pyroxene, plagioclase, abundant Fe-Ni metal and troilite. Undulatory extinction and irregular fractures are exhibited in the majority of olivine grains with minor planar fractures in few grains. Approx 40-50% Fe-Ni metal and troilite is oxidised.

Geochemistry: (S. Alkemade) FEG-SEM analysis shows that olivine and pyroxene compositions are uniform: Olivine Fa18.3-19.2, mean = Fa18.8, std = 0.33, n = 5; Low-Ca pyroxene Fs16.0-17.2, mean = Fa16.6, std = 0.45, n = 5.

Classification: Ordinary Chondrite (H6, S2, W2)

Data from:
  MB108
  Table 0
  Line 0:
State/Prov/County:South Australia
Origin or pseudonym:Nullarbor Plain
Date:8 Apr 2015
Latitude:30°41'28.7"S
Longitude:131°03'38.2"E
Mass (g):8.8
Pieces:2
Class:H6
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):18.81
Ferrosilite (mol%):16.60
Classifier:S. Alkemade, Monash
Type spec mass (g):6
Type spec location:Monash
Main mass:Monash
Finder:A. Tait
Comments:Submitted by A. Tomkins
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. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Geography:

Australia
Coordinates:
     Recommended::   (30° 41' 29"S, 131° 3' 38"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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