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O'Malley 020 | |||||||||||||||||||||||||||||||||||||||
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Basic information | Name: O'Malley 020 This is an OFFICIAL meteorite name. Abbreviation: There is no official abbreviation for this meteorite. Observed fall: No Year found: 2010 Country: Australia Mass: 13 g | ||||||||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 6493 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 28 Jan 2013 | ||||||||||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 102:
O’Malley 020 30°34’21.7"S, 131°28’51.4"E South Australia, Australia Found: 14 Apr 2010 Classification: Ordinary chondrite (H4) History: Single piece found by K. Bell on the Nullarbor Plain. Physical characteristics: Single stone lacking fusion crust. Petrography: (A. Tomkins, Monash) Well-defined chondrules (to 1.5 mm) in an optically opaque matrix. Chondrule mesostases very finely recrystalized (<1 μm). Plagioclase to <5 μm in some chondrules. Chondrule types include RP, POP, PP, BO, PO and rare devitrified glass chondrules. Fe-Ni metal grains are almost completely destroyed by weathering, whereas troilite grains are largely intact. The weathering has generated a fine network of iron oxides within the matrix. Most olivine grains show sharp optical extinction, although some have undulose extinction. Geochemistry: (A. Tomkins, Monash) Microprobe analyses show that pyroxene composition are variable; from a small number of analyses olivine appears uniform: olivine Fa19.7-20.5, mean=20.2 mol%, std=0.28, n=6; Low-Ca pyroxene Fs16.4-19.9, mean=17.9 mol%, std=1.50, n=4. Classification: Ordinary chondrite (H3, S2, W4). The type 4 classification is based on the optically opaque matrix and very fine scale of glass recrystallization. | ||||||||||||||||||||||||||||||||||||||
Data from: MB102 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. 102, MAPS 50, 1662, September 2015
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Geography: |
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) | ||||||||||||||||||||||||||||||||||||||
Proximity search: | |||||||||||||||||||||||||||||||||||||||
Revision history: |
This lists important revisions made to data for this record.
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