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Cook 012
Basic information Name: Cook 012
     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 6.6 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  H4
Recommended:  H4    [explanation]

This is 1 of 5776 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 23 Feb 2012
Writeuphelp
Writeup from MB 100:

Cook 012        30°54’49.6"S, 130°54’13.9"E

South Australia, Australia

Found: 17 Apr 2010

Classification: Ordinary chondrite (H4)

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

Physical characteristics: Two broken surfaces, ~40% smooth surface with fusion crust.

Petrography: (A. Tomkins, Monash) Well defined chondrules to 1 mm, sit in a weakly recrystallized matrix. Plagioclase <5 μm in matrix. Chondrule types include RP, POP, PP, BO and PO. Most olivine grains show sharp extinction, although some grains have undulose extinction and/or planar deformation fractures. Approximately 90% of Fe-Ni metal grains are destroyed by weathering. Troilite is also weathered, but is better preserved.

Geochemistry: (A. Tomkins, Monash) Microprobe analyses show that olivine compositions are uniform, whereas pyroxene compositions are moderately variable: olivine Fa17.5-18.4, mean=17.91 mol%, std=0.38, n=4; Low-Ca pyroxene Fs15.5-17.6, mean=16.38 mol%, std=0.77, n=5.

Classification: Ordinary chondrite (H4, S2, W3)

Data from:
  MB100
  Table 1
  Line 64:
State/Prov/County:South Australia
Origin or pseudonym:Nullarbor Plain
Date:17 Apr 2010
Latitude:30°54'49.6"S
Longitude:130°54'13.9"E
Mass (g):6.6
Pieces:1
Class:H4
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):17.91
Ferrosilite (mol%):16.38
Wollastonite (mol%):1.94
Classifier:A. Tomkins
Type spec mass (g):5.1
Type spec location:Monash
Main mass:Monash
Finder:A.Tomkins
Comments:Submitted by A. Tomkins, B. Schaefer, M. Pankhurst, K. Bell
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 Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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Geography:

Australia
Coordinates:
     Recommended::   (30° 54' 50"S, 130° 54' 14"E)

Statistics:
     This is 1 of 232 approved meteorites from South Australia, Australia (plus 3 unapproved names) (plus 4 impact craters)
     This is 1 of 702 approved meteorites from Australia (plus 46 unapproved names) (plus 27 impact craters)
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