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Watson 021
Basic information Name: Watson 021
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2015
Country: Australia
Mass:help 135 g
Meteoritical Bulletin:  MB 108  (2020)  L6
Recommended:  L6    [explanation]

This is 1 of 11509 approved meteorites (plus 6 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 2 Feb 2019
Writeup from MB 108:

Watson 021        30°35’53.2"S, 131°35’05.3"E

South Australia, Australia

Find: 12 Apr 2015

Classification: Ordinary chondrite (L6)

History: One fragment found by A. Langendam. Sub-sectioned for biology experiment in the field.

Physical characteristics: Single stone found with large crack running down the middle, fusion crust remaining (~30%), which appears to have had chipped off in places.

Petrography: (A. Tait, Monash U.) Sample has chondrules that are strongly equilibrated with the surrounding matrix, including POP, RP, PO types. Large plagioclase exhibit undulose extinction. Dihedral angles between plagioclase, olivine and pyroxene are consistently ~120 °. About 90% of the FeNi grains are oxidised, with many unoxidised troilite grains, and iron oxide veins transect the sample. Olivine shows undulose extinction and shock lamellae. Pockets exist of troilite-silicate melt emulsion (shock melting).

Geochemistry: (A. Tait, Monash) EPMA analysis show olivine and pyroxene compositions are uniform: Olivine Fa24.3-25.2, mean = Fa24.6±0.3, n = 19; Low-Ca pyroxene Fs20.6-23.0Wo1.0-1.9, mean = Fs21.2±0.7Wo1.5±0.2, n = 16.

Classification: Ordinary Chondrite (L6, S4, W4)

Specimens: Main mass and one thin section curated at Monash.

Data from:
  Table 0
  Line 0:
State/Prov/County:South Australia
Origin or pseudonym:Nullarbor Plain
Date:12 Apr 2015
Mass (g):135
Shock stage:S4
Weathering grade:W4
Fayalite (mol%):24.6±0.3 (n=19)
Ferrosilite (mol%):21.2±0.7 (n=16)
Wollastonite (mol%):1.5±0.2 (n=16)
Classifier:A. Tait, Monash
Type spec mass (g):120
Type spec location:Monash
Main mass:Monash
Finder:A. Langendam
Comments:Submitted by (A. Tait, A. Tomkins, S. Nutku, A. Langendam)
   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. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     Recommended::   (30° 35' 53"S, 131° 35' 5"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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