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Watson 020
Basic information Name: Watson 020
     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 134 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  L5
Recommended:  L5    [explanation]

This is 1 of 6721 approved meteorites (plus 4 unapproved names) classified as L5.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 14 Mar 2017
Writeuphelp
Writeup from MB 106:

Watson 020        30°33’49.9"S, 131°37’26.3" E

South Australia, Australia

Find: 11 Apr 2015

Classification: Ordinary chondrite (L5)

History: Three broken fragments foundover an area of ~20 m2 by A. Tomkins. Sub-sectioned for biology experiment in the field.

Physical characteristics: Three brown fragments with visible, well-formed chondrules on broken surfaces, minor fusion crust.

Petrography: (S. Alkemade, Monash) Chondrules are readily defined in recrystallised matrix. Chondrule types include BO, RP, PO, PP, POP, C, Poikilitic chondrules. Mineralogy includes olivine crystals olivine, pyroxene, plagioclase, Fe-Ni metal, troilite. Metal and troilite. Olivine displays both sharp and undulose extinction, and irregular fractures. Minimal weathering of the sample has occurred with some metal grains exhibiting minor oxide rims (however most have none), small percentage of troilite is oxidised. No weathering veins are present.

Geochemistry: (A. Tait, Monash) EPMA analysis show olivine and pyroxene compositions are uniform: Olivine Fa24.9-25.9, mean = Fa25.4±0.3, n = 17; Low-Ca pyroxene Fs20.9-26.0Wo1.2-2.0, mean = Fs21.7±1.1Wo1.6±0.2, n = 19.

Classification: Ordinary Chondrite (L5, S1-S2, W1)

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

Data from:
  MB106
  Table 0
  Line 0:
State/Prov/County:South Australia
Origin or pseudonym:Nullarbor Plain
Date:11 Apr 2015
Latitude:30°33'49.9"S
Longitude:131°37'26.3" E
Mass (g):134
Pieces:3
Class:L5
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):25.4±0.3 (n=17)
Ferrosilite (mol%):21.7±1.1 (n=19)
Wollastonite (mol%):1.6±0.2 (n=19)
Classifier:S. Alkemade, Monash
Type spec mass (g):124
Type spec location:Monash
Main mass:Monash
Finder:A. Tomkins
Comments:Submitted by (A. Tait, A. Tomkins, S. Nutku, A. Langendam)
Institutions
   and collections
Monash: Building 28 School of Geosciences Monash University Victoria 3800 Australia, Australia (institutional address; updated 12 Dec 2012)
Catalogs:
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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Geography:

Australia
Coordinates:
     Recommended::   (30° 33' 50"S, 131° 37' 26"E)

Statistics:
     This is 1 of 235 approved meteorites from South Australia, Australia (plus 2 unapproved names) (plus 4 impact craters)
     This is 1 of 704 approved meteorites from Australia (plus 45 unapproved names) (plus 27 impact craters)
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