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| O'Malley 004 | |||||||||||||||||||||||||||||||||||||||
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| Basic information | Name: O'Malley 004 This is an OFFICIAL meteorite name. Abbreviation: There is no official abbreviation for this meteorite. Observed fall: No Year found: 2011 Country: Australia Mass:  19 g | ||||||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 2809 approved meteorites (plus 1 unapproved name) classified as LL6. [show all] Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||||||||||||||
| Comments: | Approved 23 Feb 2012 | ||||||||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 100:
O’Malley 004 30°37’29.0"S, 131°28’14.3"E South Australia, Australia Found: 7 Apr 2011 Classification: Ordinary chondrite (LL6) History: Single piece found by A. Tomkins on the Nullarbor plain. Physical characteristics: Flat dark greenish stone shows ~30% pitted remnant fusion crust. Petrography: (A. Tait, Monash). A transparent microcrystalline recrystallized matrix dominates the sample; matrix grains are dominantly small. Chondrules have been heavily equilibrated with the surrounding matrix resulting in diffuse chondrule edges. Chondrule populations include; BO, PO, RP. Plagioclase grains have been transformed to maskelynite and range in size from (~50-100 μm). Olivine show mosaicism, undulose extinction and shock lamellae. Opaque shock-fracture networks cross-cut the sample, and melt pockets also exist. This sample has minor terrestrial weathering, except for oxidation of some larger troilite crystals. Geochemistry: (A. Tait, Monash) Microprobe analyses show that olivine and pyroxene compositions are uniform: olivine Fa31.4-32.0, mean=31.74 mol%, std=0.27, n=4; Low-Ca pyroxene Fs25.5-26.4, mean=26.04 mol%, std=0.47, n=3. Classification: Ordinary Chondrite (LL6, S5, W1). | ||||||||||||||||||||||||||||||||||||||
| Data from: MB100 Table 1 Line 1713: |
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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. 100, MAPS 49, E1-E101 (2014)
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Geography:
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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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