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Ifould Lake 001
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:help 40.9 g
Classification
  history:
Meteoritical Bulletin:  MB 99  (2011)  L5
Recommended:  L5    [explanation]

This is 1 of 6528 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
Writeuphelp
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:
State/Prov/County:South Australia
Origin or pseudonym:Nullarbor
Date:24 Aug 2008
Latitude:30°51'S
Longitude:132°05'E
Mass (g):40.9
Pieces:1
Class:L5
Shock stage:S5
Weathering grade:W2
Fayalite (mol%):25.4
Ferrosilite (mol%):21.7
Classifier:K.-L.N. Bell
Type spec mass (g):40.9
Type spec location:Monash
Main mass:Monash
Finder:K.-L. N. Bell
Comments:Submitted by K.-L.N. Bell, A. Tomkins
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. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
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Geography:

Australia
Coordinates:
     Recommended::   (30° 51'S, 132° 5'E)

Statistics:
     This is 1 of 232 approved meteorites from South Australia, Australia (plus 3 unapproved names) (plus 4 impact craters)
     This is 1 of 702 approved meteorites from Australia (plus 46 unapproved names) (plus 27 impact craters)
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