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| Ifould Lake 001 | |||||||||||||||||||||||||||||||||||||
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| Basic information | Name: Ifould Lake 001 This is an OFFICIAL meteorite name. Abbreviation: There is no official abbreviation for this meteorite. Observed fall: No Year found: 2008 Country: Australia Mass:  40.9 g | ||||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 8581 approved meteorites (plus 4 unapproved names) classified as L5. [show all] Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||||||||||||
| Comments: | Approved 26 Oct 2010 | ||||||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 99:
Ifould Lake 001 30°51’S, 132°05’E South Australia, Australia Found: 24 Aug 2008 Classification: Ordinary chondrite (L5) History: A solitary piece was found lying on the stony surface of the Nullarbor Plain by K.L. Bell. Physical characteristics: The sub-rounded, pyramidal-shaped stone weighs 40.9 g and measures 3.5 cm on the longest axis. The exterior is dark reddish brown, with the exception of darker, remnant fusion crust (~10%) and several paler colored macro-chondrules, up to 5 mm. The interior is dark brown to black and shows chondrules and metallic specks. Petrography: (Kim Lai N. Bell, Monash). Chondrules and chondrule fragments lie within a fine-grained recrystallized matrix cross cut by dark μm to mm thick veins. Mineralogy consists of olivine, pyroxene, plagioclase, sulfides, Fe-Ni metal and minor ringwoodite, maskylenite and chromite. Olivine displays undulose to mosaic extinction, and larger grains contain PDFs. Pyroxene grains also exhibit similar textures. Plagioclase generally >50 μm, with some grains replaced by maskylenite. Troilite (~10%) and Fe-Ni metal (3%) occur as irregularly shaped grains, with up to 35% replaced by oxides. Chondrules 0.3 to 5 mm, mean ~0.6 mm, with some more readily discernable than others due to recrystallization. Textural types include BO, POP, GOP, PP, RP, PO, and PP. An Al-rich chondrule containing maskylenite, olivine and very fine-grained chromite was observed. Geochemistry: EMPA (wt%) Olivine: SiO2 = 37.55, TiO2 = 0.01, Al2O3 = 0.03, FeO = 23.32, MnO = 0.47, MgO = 38.52, CaO = 0.02, Na2O = 0.01, K2O = 0.01, (Fa = 25.35 mol%, σ = 0.79, n = 11). Low-Ca pyroxene: SiO2 = 54.24, TiO2 = 0.18, Al2O3 = 0.27, FeO = 14.37, MnO = 0.45, MgO = 28.59, CaO = 0.64, Na2O = 0.03, K2O = 0.01, (Fs = 21.72 mol%, σ = 0.73, n = 2). Plagioclase: SiO2 = 71.14, TiO2 = 0.05, Al2O3 = 22.94, FeO = 0.24, MnO = 0.01, MgO = 0.01, CaO = 2.30, Na2O = 2.60, K2O = 1.08 (An = 28.95, σ=1.84, n = 5). Kamacite: Ni = 6.39, Co = 0.89. Troilite: Fe = 62.96, Ni = 0.10. Pentlandite: Ni = 8.49, Co = 0.34. Classification: Ordinary chondrite (L5, S5, W2). Specimens: A single specimen plus one polished thin section are held by A. Tomkins at Monash. | ||||||||||||||||||||||||||||||||||||
| Data from: MB99 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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| References: | Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
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Geography:
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Statistics: This is 1 of 240 approved meteorites from South Australia, Australia (plus 3 unapproved names) (plus 4 impact craters) This is 1 of 717 approved meteorites from Australia (plus 46 unapproved names) (plus 27 impact craters) | ||||||||||||||||||||||||||||||||||||
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