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Biduna Blowhole 001
Basic information Name: Biduna Blowhole 001
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2009
Country: Australia
Mass:help 103.4 g
Meteoritical Bulletin:  MB 99  (2011)  L4
Recommended:  L4    [explanation]

This is 1 of 1715 approved meteorites (plus 4 unapproved names) classified as L4.   [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 from MB 99:

Biduna Blowhole 001        31°01’S, 131°19’E

South Australia, Australia

Found: 5 Dec 2009

Classification: Ordinary chondrite (L4)

History: The first piece was found on the Nullarbor Plain by A. Langendam. A further 16 fragments were located within a 30 m radius of the initial find.

Physical characteristics: Combined weight of all 17 pieces is 103.4 g, with the largest piece measuring 5 x 4 x 1 cm. The weathered surface is dark brown to black with small patches of orange lichens. Several pieces fit together like a jigsaw.

Petrography: (Kim Lai N. Bell, Monash) Main mass contains up to 65% chondrules within a dark, heavily rusted matrix. Mineralogy consists of olivine, pyroxene, minor plagioclase, Fe-Ni metal and sulfides. The dominant minerals, olivine and pyroxene, are mostly found in chondrules, with smaller grains (<50 µm) in the matrix. Plagioclase occurs in minor amounts and rarely exceeds 50 μm. Chondrules lack glass, are easy to discern and sometimes rimmed by sulfides or olivine. Chondrule types include RP, POP, GOP, PO and BO, with sizes ranging 0.1-2 mm and averaging 0.4 mm. Olivine and pyroxene grains display irregular to undulose extinctions, with larger grains containing planar fracturing. Up to 97% of all Fe-Ni metals and troilite are replaced by oxides.

Geochemistry: EMPA (wt%) Olivine: SiO2 = 38.25, TiO2 = 0.02, Al2O3 = 0.02, FeO = 24.94, MnO = 0.45, MgO = 37.47, CaO = 0.05, Na2O = 0.01, K2O = 0.01, (Fa = 25.6 mol%, σ = 2.5, n = 6). Low-Ca Pyroxene: SiO2 = 56.34, TiO2 = 0.10, Al2O3 = 0.21, FeO = 14.17, MnO = 0.44 MgO = 28.38, CaO = 0.40, Na2O = 0.03, K2O = 0.01, (Fs = 21.44 mol%, σ = 2.0, n = 6). Kamacite: Ni = 5.59, Co = 0.58. Troilite: Fe = 61.98, Ni = 0.10. Fe-Ni sulfide: Fe = 56.85, Ni = 1.33.

Classification: Ordinary chondrite (L5, S3, W4).

Specimens: All samples and one thin section are held by A. Tomkins at Monash.

Data from:
  Table 0
  Line 0:
State/Prov/County:South Australia
Origin or pseudonym:Nullarbor
Date:5 Dec 2009
Mass (g):103.4
Shock stage:S3
Weathering grade:W4
Fayalite (mol%):25.6
Ferrosilite (mol%):21.4
Classifier:K.-L.N. Bell
Type spec mass (g):103.4
Type spec location:Monash
Main mass:Monash
Finder:A. Langendam
Comments:Submitted by K.-L.N. Bell, A. Tomkins
   and collections
Monash: Building 28 School of Geosciences Monash University Victoria 3800 Australia, Australia (institutional address; updated 12 Dec 2012)
References: Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
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     Recommended::   (31° 1'S, 131° 19'E)

     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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