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Watson 007
Basic information Name: Watson 007
     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 19.5 g
Meteoritical Bulletin:  MB 99  (2011)  EL3
Recommended:  EL3    [explanation]

This is 1 of 26 approved meteorites classified as EL3.   [show all]
Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 3), and Enstatite-rich meteorites
Comments: Approved 18 Jan 2011
Writeup from MB 99:

Watson 007        30°29’S, 131°41’E

South Australia, Australia

Found: 10 May 2009

Classification: Enstatite chondrite (EL3)

History: A single piece was found on the Nullarbor Plain by A. Langendam.

Physical characteristics: The 19.5 g specimen measures 3.2 x 2.7 x 1.2 cm. Some chondrules, as well as remnant fusion crust, are observable on the maroon-colored weathered surface.

Petrography: (Kim Lai N. Bell, Monash). This chondritic meteorite has sharply defined chondrules within a fine-grained, dark matrix. Mineralogy is dominated by orthopyroxene but also includes Fe-Ni metal, clinopyroxene, sulfides plus trace amounts of olivine. Chondrules (0.25-2 mm with an average of 0.7 mm) include RP and PP. Some glass present in the chondrules. Orthopyroxene grains have undulose extinction and irregular fracturing. Olivine is rare with the occasional small grain (<50 μm) occurring within PP chondrules. Fe-Ni metals (7%), plus sulfides (6%) occur as small irregular grains that have been heavily oxidized, with up to 97% being replaced. The chondrules are quite large with a high proportion exceeding 1 mm and the majority exceeding 0.5 mm, consistent with EL rather than EH chondrite classification and presence of manganoan daubréelite (Mg-free) also suggests EL rather than EH.

Geochemistry: EMPA (wt%) Olivine: SiO2 = 41.77, TiO2 = 0.00, Al2O3 = 0.03, FeO = 0.13, MnO = 0.02, MgO = 57.90, CaO = 0.02, Na2O = 0.02, K2O = 0.00, (Fa0.22). Low-Ca pyroxene: SiO2 = 58.82, TiO2 = 0.01, Al2O3 = 0.19, FeO = 0.37, MnO = 0.01, MgO = 340.69, CaO = 0.28, Na2O = 0.01, K2O = 0.00 (En99.92±0.21, n = 14). Troilite: Cr = 0.45, Ti = 0.48, Ni = 0.20. Daubréelite: Cr = 31.61, Ti = 0.13, Mn = 1.89, Ni = 0.07.

Classification: Enstatite chondrite (EL3, S2, W4).

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:10 May 2009
Mass (g):19.5
Shock stage:S2
Weathering grade:W4
Fayalite (mol%):0.22
Ferrosilite (mol%):0.08
Classifier:K.-L.N. Bell
Type spec mass (g):19.5
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::   (30° 29'S, 131° 41'E)

     This is 1 of 240 approved meteorites from South Australia, Australia (plus 3 unapproved names) (plus 4 impact craters)
     This is 1 of 718 approved meteorites from Australia (plus 46 unapproved names) (plus 27 impact craters)
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