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Watson 004
Basic information Name: Watson 004
     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 1.3 g
Meteoritical Bulletin:  MB 99  (2011)  H4
Recommended:  H4    [explanation]

This is 1 of 6031 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 004        30°29’S, 131°33’E

South Australia, Australia

Found: 26 Aug 2008

Classification: Ordinary chondrite (H4)

History: A small piece, was found by A. Tomkins, 200 m from Watson 003.

Physical characteristics: This small meteorite weighs 1.3 g and has a diameter of ~1.4 cm. The exterior is rusty brown with small patches of a darker fusion crust. The chondritic texture is best observed on a freshly cut surface.

Petrography: (Kim Lai N. Bell, Monash). This sample is composed of easily defined chondrules in a highly rusted matrix. Chondrules range in size from 0.1 to 2 mm with an average size of 0.5 mm. The chondrules are glass-free and include textural types RP, GOP, BO, PO and POP. Olivine and pyroxene grains have a straight to weakly undulose extinction with irregular fracturing. Troilite (7%) and Fe-Ni metals (4%), kamacite and taenite, have mostly been replaced (~71%) by oxides.

Geochemistry: EMPA (wt%) Olivine: SiO2 = 38.74, TiO2 = 0.02, Al2O3 = 0.03, FeO = 18.15, MnO = 0.48, MgO = 42.86, CaO = 0.03, Na2O = 0.01, K2O = 0.01, (Fa = 19.22 mol%, σ = 1.17, n = 9). Low-Ca pyroxene: SiO2 = 55.59, TiO2 = 0.19, Al2O3 = 0.38, FeO = 11.37, MnO = 0.48, MgO = 31.26, CaO = 0.73, Na2O = 0.03, K2O = 0.00, (Fs = 16.77 mol%).

Classification: Ordinary Chondrite (H4, S2, 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:26 Aug 2008
Mass (g):1.3
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):19.2
Ferrosilite (mol%):16.8
Classifier:K.-L.N. Bell
Type spec mass (g):1.3
Type spec location:Monash
Main mass:Monash
Finder:A. Tomkins
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° 29'S, 131° 33'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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