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Watson 017
Basic information Name: Watson 017
     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 1800 g
Meteoritical Bulletin:  MB 105  (2016)  H5
Recommended:  H5    [explanation]

This is 1 of 10151 approved meteorites (plus 18 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 8 Jan 2016
Writeup from MB 105:

Watson 017        30°36’19.2"S, 131°33’21.1"E

South Australia, Australia

Find: 2015 Apr 12

Classification: Ordinary chondrite (H5)

History: Initial fragments found by R. Stokes on a claypan. Further fragments, followed by two main masses were found over a ~30 m2 area, by the Monash team.

Physical characteristics: Numerous <5 cm fragments were found, almost none showing fusion crust. Two main mass fragments were found next to each other, the largest being 532 g. It has extensive weathering cracks, with loose fragments in the final stages of flaking off. These two masses were covered in lichen and had 40% fusion crust.

Petrography: (A. Tait, Monash) Sample contains both Type I and Type II chondrules. Chondrule edges are poorly defined, although a few relict chondrules do exist with well-defined edges, they appear to be fragmented. Chondrule types observed are: BO, POP, RP, PO. The matrix is opaque and extensively recrystallized, no large (>50 μm) secondary feldspars were observed. FeNi metal and trolite exhibits moderate ~30% oxidation around the perimeter of the meteorite. The center of the meteorite shows higher oxidation (~80%) with some corrosion cavities, and extensive wreathing veins. Most olivinea show undulous extinction, approximately 5-10% of olivines show shock lamellae, no higher shock indicators are present.

Geochemistry: (A. Tait, A. Landendam, Monash) FEG-SEM analyses show that olivine and pyroxene compositions are uniform: olivine Fa17.9-19.7, mean= Fa18.0±0.9, n=14; Low-Ca pyroxene Fs15.0-18.7Wo1.1-1.9, mean= Fs16.3±1.0Wo1.3±0.3, n=13.

Classification: Ordinary Chondrite (H5, S3, W3)

Specimens: All fragments, main mass and a thin section at Monash.

Data from:
  Table 0
  Line 0:
State/Prov/County:South Australia
Origin or pseudonym:Nullarbor Plain
Date:2015 Apr 12
Mass (g):1800
Shock stage:S3
Weathering grade:W3
Fayalite (mol%):18.0
Ferrosilite (mol%):16.3
Wollastonite (mol%):1.3
Classifier:A. Tait, Monash
Type spec mass (g):1176
Type spec location:Monash
Main mass:Monash
Finder:R. Stokes
Comments:Submitted by (A. Tait, A. Tomkins, S. Alkemade, S. Nutku, R. Stokes, 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. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     Recommended::   (30° 36' 19"S, 131° 33' 21"E)

     This is 1 of 238 approved meteorites from South Australia, Australia (plus 2 unapproved names) (plus 4 impact craters)
     This is 1 of 710 approved meteorites from Australia (plus 45 unapproved names) (plus 27 impact craters)
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