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Watson 013
Basic information Name: Watson 013
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2010
Country: Australia
Mass:help 47.1 g
Meteoritical Bulletin:  MB 102  (2013)  H3
Recommended:  H3    [explanation]

This is 1 of 633 approved meteorites (plus 2 unapproved names) classified as H3.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 28 Jan 2013
Writeup from MB 102:

Watson 013        30°34’30.0"S, 131°30’5.9"E

South Australia, Australia

Found: 14 Apr 2010

Classification: Ordinary chondrite (H3)

History: Single piece found by A. Tomkins on the Nullarbor Plain.

Petrography: (A. Tomkins, Monash) Well-defined chondrules (most <1 mm, some to 2 mm) in a highly porous light-colored transparent matrix; there is no matrix glass. Plagioclase to 20 μm. Chondrule types include RP, POP, PP, BO and PO; there are rare very finely recrystallized glassy chondrules. Chondrule mesostases finely recrystallized (<1 μm). The porosity is variable, being more porous in zones where <5% of metal is rusted, less porous in domains where metal is >20% rusted. Fe-Ni metal grains (10-15%) are variably irregular and approximately twice as abundant as troilite, with which they are occasionally conjoined. Most conjoined metal-troilite grains have sharp contacts, and there are rare domains of troilite in metal with adjacent Cu metal. Olivine grains show sharp extinction.

Geochemistry: (A. Tomkins, Monash) Microprobe analyses show that olivine and pyroxene compositions are highly heteorgeneous: olivine Fa18.6-28.1, mean=20.7 mol%, std=4.1, n=5; Low-Ca pyroxene Fs9.3-17.9, mean=15.7 mol%, std=3.2, n=5; Wo0.6-4.0. Average compositions are most consistent with a H chondrite designation.

Classification: Ordinary chondrite (H3, S2, W1). The type 3 classification is based on the heterogeneity of olivine and pyroxene compositions; the glass recrystallization implies upper type 3.

Data from:
  Table 0
  Line 0:
State/Prov/County:South Australia
Origin or pseudonym:Nullarbor Plain
Date:14 Apr 2010
Mass (g):47.1
Shock stage:S1
Weathering grade:W1
Fayalite (mol%):20.7±4.1
Ferrosilite (mol%):15.7±3.2
Wollastonite (mol%):1.46
Classifier:A. Tomkins, Monash
Type spec mass (g):25.1
Type spec location:Monash
Main mass:Monash
Comments:Submitted by A. Tomkins, B. Schaefer, M. Pankhurst, K. Bell
   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. 102, MAPS 50, 1662, September 2015
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     Recommended::   (30° 34' 30"S, 131° 30' 6"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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