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| O'Malley 023 | |||||||||||||||||||||||||||||||||||||||
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| Basic information | Name: O'Malley 023 This is an OFFICIAL meteorite name. Abbreviation: There is no official abbreviation for this meteorite. Observed fall: No Year found: 2012 Country: Australia Mass:  17.8 g | ||||||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 12780 approved meteorites (plus 11 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 Jan 2019 | ||||||||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 108:
O’Malley 023 30°38’57.7"S, 131°28’20.2"E South Australia, Australia Find: 17 May 2012 Classification: Ordinary chondrite (L6) History: Two adjacent pieces found by A. Tomkins amongst limestone gravel Physical characteristics: Two fragments with smooth brown-black fusion crust, covering 70% of the larger sample. Petrography: (L. Bowlt) Poorly defined fragmented chondrules, ranging in size up to 2 mm, sit in a strongly recrystallized matrix. Mineralogy includes olivine, pyroxene, plagioclase, troilite, Fe-Ni metal and chromite. Chondrule types include BO, GOP and PO. Plagioclase is very coarse grained with sizes commonly in the range of 80 μm. Olivine grains show mosaicism and shock lamellae. Plagioclase is partly converted to maskelynite and there are shock melt veins. Incomplete transformation of plagioclase to maskelynite suggests shock classification of S4. 20-30% of FeNi metal and troilite are weathered with thin oxide rims. Geochemistry: (L. Bowlt, Monash) Microprobe analyses show that olivine and pyroxene compositions are uniform: olivine Fa22.2-22.9, mean= Fa22.5, std=0.31, n=5; Low-Ca pyroxene Fs18.6-19.7 , mean= Fa19.3, std=0.55 , n=5. Classification: Ordinary Chondrite (L6, S4, W3) | ||||||||||||||||||||||||||||||||||||||
| Data from: MB108 Table 0 Line 0: |
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| Institutions and collections |
Monash: Building 28
School of Geosciences
Monash University
Victoria 3800
Australia, Australia (institutional address; updated 12 Dec 2012) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Geography:
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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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