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Watson 018
Basic information Name: Watson 018
     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 27.9 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 532 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 5 Jun 2016
Writeuphelp
Writeup from MB 105:

Watson 018        30°35’34.7"S, 131°38’23.4"E

South Australia, Australia

Find: 2015 Apr 4

Classification: Ureilite

History: Single partly buried stone found by A Tomkins.

Physical characteristics: Unusual greenish brown fusion crust covers 65% of the sample; coarse 3 mm pyroxene grains can be seen through the fusion crust, defined by distinct cleavage. The broken surfaces reveal coarse elongated, square edged silicate grains exceeding 5 mm, presumably pyroxene crystals, amongst melted black material.

Petrography: (S. Alkemade) This sample contains preferentially oriented, elongate coarse crystals of olivine and pigeonite meeting at triple junctions, with graphite + diamond along grain boundaries. Orthopyroxene and augite were not observed. The crystal sizes range from 1-5 mm, with majority 4-5 mm. Reduction rims affect the margins of all olivine grains, and also occur along trangressive fractures within olivine, characterized by micron sized blebs of metal amongst low FeO olivine.

Geochemistry: (S. Alkemade) Microprobe analysis show: olivine Fa20.4-20.5, mean = Fa20.4±0.1, n = 4; pigeonite Fs16.9-17.4Wo8.6, mean = Fs17.2Wo8.6, n = 3.

Classification: Olivine-pigeonite ureilite

Specimens: 27.9 g at Monash including a thin section.

Data from:
  MB105
  Table 0
  Line 0:
State/Prov/County:South Australia
Origin or pseudonym:Nullarbor Plain
Date:2015 Apr 4
Latitude:30°35'34.7"S
Longitude:131°38'23.4"E
Mass (g):27.9
Pieces:1
Class:Ureilite
Weathering grade:low
Fayalite (mol%):20.4
Ferrosilite (mol%):17.2
Wollastonite (mol%):8.6
Classifier:S. Alkemade, Monash
Type spec mass (g):27.9
Type spec location:Monash, SAM
Main mass:Monash, SAM
Finder:A. Tomkins
Comments:Submitted by A. Langendam
Institutions
   and collections
Monash: Building 28 School of Geosciences Monash University Victoria 3800 Australia, Australia (institutional address; updated 12 Dec 2012)
SAM: Department of Mineralogy, South Australian Museum, North Terrace, Adelaide, South Australia 5000, Australia; Website (institutional address; updated 18 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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Geography:

Australia
Coordinates:
     Recommended::   (30° 35' 35"S, 131° 38' 23"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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