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Watson 022
Basic information Name: Watson 022
     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 11.1 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  L6
Recommended:  L6    [explanation]

This is 1 of 12780 approved meteorites (plus 11 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 14 Mar 2017
Writeuphelp
Writeup from MB 106:

Watson 022        30°35’29.2"S, 131°33’49.0"E

South Australia, Australia

Find: 12 Apr 2015

Classification: Ordinary chondrite (L6)

History: Single stone found among limestone gibber by A. Tomkins. Sub-sectioned for biology experiment in the field.

Physical characteristics: A black-brown oriented individual stone with subtle roll-over lip over the broken back face.

Petrography: (S. Alkemade, Monash) Poorly defined chondrules with indistinct edges reside in fine- to coarse-grained matrix. Chondule types include GOP, POP, BO, RP, PO, Poikilitic. Mineralogy consists of olivine, pyroxene, plagioclase, minor Fe-Ni metal and troilite. Strong shock features are observed. Olivine and pyroxene display undulose and weak mosaic extinction show planar lamellae. An isotropic pseudotachylite vein cross cuts the sample and numerous sulfide droplets reside in opaque shock viens and melt pockets. Moderate weathering of the sample has occurred with troilite ~60% oxidized (Fe-Ni metal rare in sample).

Geochemistry: (A. Tait, Monash) EPMA analysis show olivine and pyroxene compositions are uniform: Olivine Fa25.0-26.1, mean = Fa25.6±0.3, n = 17; Low-Ca pyroxene Fs20.8-24.6Wo1.2-2.1, mean = Fs21.7±0.8Wo1.6±0.2, n = 22.

Classification: Ordinary Chondrite (L6, S4, W2)

Specimens: 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:12 Apr 2015
Latitude:30°35'29.2"S
Longitude:131°33'49.0"E
Mass (g):11.1
Pieces:1
Class:L6
Shock stage:S4
Weathering grade:W2
Fayalite (mol%):25.6±0.3 (n=17)
Ferrosilite (mol%):21.7±0.8 (n=22)
Wollastonite (mol%):1.6±0.2 (n=22)
Classifier:S. Alkemade, Monash
Type spec mass (g):7
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° 35' 29"S, 131° 33' 49"E)

Statistics:
     This is 1 of 241 approved meteorites from South Australia, Australia (plus 3 unapproved names) (plus 4 impact craters)
     This is 1 of 719 approved meteorites from Australia (plus 11 unapproved names) (plus 27 impact craters)
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