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Watson 005
Basic information Name: Watson 005
     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 1.6 g
Meteoritical Bulletin:  MB 99  (2011)  H5
Recommended:  H5    [explanation]

This is 1 of 10318 approved meteorites (plus 18 unapproved names) classified as H5.   [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 005        30°30’S, 131°42’E

South Australia, Australia

Found: 9 May 2009

Classification: Ordinary chondrite (H5)

History: A solitary piece found by A. Langendam on the stony surface of the Nullarbor Plain.

Physical characteristics: This meteorite is dark maroon in color, weighs 1.6 g and measures 1.7 cm on the longest axis. Small chondrules and metallic grains are best observed on a fresh surface.

Petrography: (Kim Lai N. Bell, Monash). Readily discernible chondrules lie in a heavily stained matrix, which makes it difficult to gauge the amount of recrystallization in the matrix. Chondrules are devoid of glass and range from 0.25-1 mm in size with an average of 0.3 mm. Textural types include RP, POP, BO and PO with some of the latter rimmed by olivine. Mineralogy consists of olivine, pyroxenes, feldspar, Fe-Ni metal and sulfides. Olivine and pyroxene grains have a straight to undulose extinction with planar fracturing evident in larger grains. Twinned plagioclase occurs as an accessory mineral and is generally <50 μm in size. Metal phases (5%) include kamacite and taenite, which can occur as small irregular shaped grains. Troilite (7%) also occurs in a similar fashion to the metallic phases. Both metal and sulfide minerals have been oxidized, with up to 28% of these minerals being replaced by oxides.

Geochemistry: EMPA (wt%) Olivine: SiO2 = 38.81, TiO2 = 0.02, Al2O3 = 0.01, FeO = 17.96, MnO = 0.45, MgO = 42.45, CaO = 0.03, Na2O = 0.01, K2O = 0.00, (Fa = 19.19 mol%, σ = 0.34, n = 8). Low-Ca pyroxene: SiO2 = 55.62, TiO2 = 0.06, Al2O3 = 0.14, FeO = 12.43, MnO = 0.46, MgO = 30.79, CaO =0.39, Na2O = 0.02, K2O = 0.00, (Fs = 18.43 mol%, σ = 2.27, n = 4). Feldspar: SiO2 = 64.97, TiO2 = 0.01, Al2O3 = 18.45, FeO = 1.20, MnO = 0.00, MgO = 0.00, CaO = 0.00, Na2O = 0.71, K2O = 16.38, (Or = 93.12 mol%).

Classification: Ordinary Chondrite (H5, S2, W2).

Specimens: Single 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:9 May 2009
Mass (g):1.6
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):19.2
Ferrosilite (mol%):18.4
Classifier:K.-L.N. Bell
Type spec mass (g):1.6
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° 30'S, 131° 42'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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