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Watson 015
Basic information Name: Watson 015
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2013
Country: Australia
Mass:help 457 g
Meteoritical Bulletin:  MB 104  (2015)  H4
Recommended:  H4    [explanation]

This is 1 of 6031 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 18 Jul 2015
Writeup from MB 104:

Watson 015        30°34’22.10"S, 131°44’48.10"E

South Australia, Australia

Purchased: 2013 Apr 09

Classification: Ordinary chondrite (H4)

History: Large fragments found by A Langendam

Physical characteristics: A large 9 cm block with partial fusion crust, and a second small fragments with 65% fusion crust, both weathered brown.

Petrography: (J. Savage) Porphyritic chondrules range in size from 0.5 mm to an anomalous 4 mm, with an average size of 1.5 mm. Porphyritic chondrules smaller than 0.5 mm are indistinguishable from the matrix where as those in the size range mentioned above are easily identified. Non-porphyritic chondrules are all of similar size (~1.5 mm) and their boundaries are easily differentiated from the matrix. Some chondrule boundaries show intergrowths of matrix/chondrule composition. Metal and metal-oxides are pervasive and constitute 30% of the matrix. Recrystallized glass makes up 10% of the matrix and the remaining 60% is made up from re-equilibrated chondrites of olivine-pyroxene composition. The mineralogy of the meteorite includes olivine, pyroxene, Fe-Ni metal and troilite. The chondrule types present are PP, POP, BO, C, GOP and PO. Most olivine and pyroxene grains have sharp extinction, with some finer grains beginning to develop undulose extinction. 98% of Fe-Ni metal has been oxidized with sulphides showing 60% weathering. Where troilite grains are still visible, weathering is localized on the grain rims.

Geochemistry: (J. Savage, Monash) Microprobe analyses show that olivine and pyroxene compositions are uniform: olivine Fa18.7-19.6, mean Fa19.2±0.3, n=5; Low-Ca pyroxene Fs17.1-17.5, mean Fs17.2±0.2, n=5.

Classification: Ordinary chondrite (H4, S2, W4)

Specimens: All specimens and one thin section held by A. Tomkins.

Data from:
  Table 0
  Line 0:
State/Prov/County:South Australia
Origin or pseudonym:Nullarbor Plain
Date:P 2013 Apr 09
Mass (g):457
Shock stage:S2
Weathering grade:W4
Fayalite (mol%):19.2
Ferrosilite (mol%):17.2
Wollastonite (mol%):1.62
Classifier:J. Savage, Monash
Type spec mass (g):395
Type spec location:Monash
Main mass:Monash
Finder:A. Langendam
Comments:Submitted by (A. Tait, A. Tomkins, A. Bowlt, S. Nutku, J. Savage)
   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. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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     Recommended::   (30° 34' 22"S, 131° 44' 48"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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