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O'Malley 017
Basic information Name: O'Malley 017
     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 4.9 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  L6
Recommended:  L6    [explanation]

This is 1 of 11577 approved meteorites (plus 6 unapproved names) classified as L6.   [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 017        30°32’41.2"S, 131°15’33.4"E

South Australia, Australia

Found: 10 Apr 2011

Classification: Ordinary chondrite (L6)

History: Three flat broken pieces found by E. Mare on the Nullarbor Plain.

Physical characteristics: Significantly weathered and without fusion crust.

Petrography: (E. Mare, Monash) Few indistinct chondrules (to 1 mm) in a heavily recrystallized matrix. Plagioclase to 100 μm. Chondrule types include CC and PO, however most are difficult to distinguish. Fe-Ni metal and troilite have been almost completely replaced by oxides, which comprise 3-5% of the meteorite. A large (7 mm) clast composed of olivine (~15%) and low-Ca pyroxene (~65%) phenocrysts (with minor Ca-pyroxene) in a groundmass (~20%) of plagioclase, skeletal olivine and chromite. Inside this clast there is no evidence for any metal or troilite having been present. Oxides occur along fractures in olivine and pyroxene grains. This clast has indistinct margins, indicating that it has been affected by metamorphism and is most likely to be an unusually large chondrule, rather than a breccia clast. Olivine grains have weak undulose extinction.

Geochemistry: (E. Mare, Monash) Microprobe analyses show that olivine and pyroxene compositions are uniform: olivine Fa24.5-24.9, mean=24.74 mol%, std=0.15, n=10; Low-Ca pyroxene Fs21.0-21.8, mean=21.25 mol%, std=0.27, n=7.

Classification: Ordinary chondrite (L6, S2, W4)

Data from:
  MB100
  Table 1
  Line 1726:
State/Prov/County:South Australia
Origin or pseudonym:Nullarbor Plain
Date:10 Apr 2011
Latitude:30°32'41.2"S
Longitude:131°15'33.4"E
Mass (g):4.9
Pieces:1
Class:L6
Shock stage:S2
Weathering grade:W4
Fayalite (mol%):24.74
Ferrosilite (mol%):21.25
Wollastonite (mol%):1.39
Classifier:E. R. Mare
Type spec mass (g):3.5
Type spec location:Monash
Main mass:Monash
Finder:E. Mare
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' 41"S, 131° 15' 33"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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