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Watson 011
Basic information Name: Watson 011
     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 4.1 g
Meteoritical Bulletin:  MB 99  (2011)  H4
Recommended:  H4    [explanation]

This is 1 of 5993 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 26 Oct 2010
Writeup from MB 99:

Watson 011        30°31’S, 131°30’E

South Australia, Australia

Found: 12 May 2009

Classification: Ordinary chondrite (H4)

History: D. Bradley found a single piece lying on the Nullarbor Plain.

Physical characteristics: This sample weighs 4.1 g and measures 1.8 cm x 1.4 cm x 0.8 cm. The exterior is dark brown, rusty, and ~90% fusion crusted.

Petrography: (Kim Lai N. Bell, Monash). Chondrules lie within a dark rusty brown matrix. Mineralogy is composed of olivine, pyroxene, Fe-Ni metal and sulfides. Olivine and pyroxene grains have undulose extinctions with larger grains exhibiting planar fracturing. Chondrule types include, RP, POP, BO and PP. Glass is not present with chondrules just discernible and ranging in size from 0.1-1 mm, with an average of 0.5 mm. Fe-Ni metals (4%) kamacite and taenite and the sulfide troilite (8%) occur as irregular shaped grains, with up to ~83% replaced by oxides.

Geochemistry: EMPA (wt%) Olivine: SiO2 = 38.89, TiO2 = 0.07, Al2O3 = 0.03, FeO = 18.09, MnO = 0.45, MgO = 42.08, CaO = 0.03, Na2O = 0.01, K2O = 0.01, (Fa = 19.44 mol%, σ = 1.09, n = 8). Low Ca-Pyroxene: SiO2 = 55.86, TiO2 = 0.09, Al2O3 = 0.44, FeO = 11.29, MnO = 0.50, MgO = 30.49, CaO = 0.66, Na2O = 0.04, K2O = 0.01, (Fs = 16.86 mol%, σ = 1.14, n = 5). Kamacite: Ni = 6.48, Co = 0.32. Troilite: Fe = 63.04, Ni = 0.05.

Classification: Ordinary chondrite (H5, S3, W3).

Specimens: Sample and one thin section held by A. Tomkins at Monash.

Data from:
  Table 0
  Line 0:
State/Prov/County:South Australia
Origin or pseudonym:Nullarbor
Date:12 May 2009
Mass (g):4.1
Shock stage:S3
Weathering grade:W3
Fayalite (mol%):19.4
Ferrosilite (mol%):16.9
Classifier:K.-L.N. Bell
Type spec mass (g):4.1
Type spec location:Monash
Main mass:Monash
Finder:D. Bradley
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::   (30° 31'S, 131° 30'E)

     This is 1 of 238 approved meteorites from South Australia, Australia (plus 2 unapproved names) (plus 4 impact craters)
     This is 1 of 710 approved meteorites from Australia (plus 45 unapproved names) (plus 27 impact craters)
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