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Basic information Name: Hart
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2010
Country: United States
Mass:help 966 g
Meteoritical Bulletin:  MB 101  (2012)  CK3
Recommended:  CK3    [explanation]

This is 1 of 79 approved meteorites classified as CK3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CK chondrites, CK3 chondrites, and CV-CK clan chondrites
Comments: Approved 12 Dec 2012
Revised 28 Sep 2020: Corrected weathering grade
Writeup from MB 101:

Hart        34.377182°N, 102.116719°W

Castro County, Texas, USA

Found: 2010 March

Classification: Carbonaceous chondrite (CK3)

History: In March 2010, a field worker found a dense stone beside a road located 0.25 mile from the town of Hart. The specimen was purchased by Jason Phillips in July 2012.

Physical characteristics: A single, large brownish stone weighing 966 g.

Petrography: (A. Irving and S. Kuehner, UWS) Separated, medium-sized chondrules and rare, small CAIs occur within a fairly altered, deep reddish-brown matrix. Discrete grains of Cr-magnetite are present in PO chondrules. One CAI (diameter 150 μm) is composed of gehlenite + spinel + perovskite with a rim containing andradite garnet; a separate large grain of gehlenite was found. The matrix contains Cr-magnetite and minor Ni-poor kamacite (some grains rimmed by magnetite), as well as secondary iron hydoxides. Most olivine and pyroxene are very magnesian, but more ferroan grains are present in the matrix.

Geochemistry: Olivine (Fa0.9-50.2; Cr2O3 = 0.19-0.21 wt.%), orthopyroxene (Fs0.8-16.2Wo0.8-1.2), magnesian pigeonite (Fs0.9Wo20.7), subcalcic diopside (Fs2.1Wo34.8), diopside (Fs0.6Wo44.9), Al-Ti-rich diopside (Fs0.4Wo55.1; TiO2 = 1.2 wt.%, Al2O3 = 9.6 wt.%).

Classification: Carbonaceous chondrite (CK3, S2, W2/3).

Specimens: A total of 20.96 g of sample and one polished thin section are on deposit at UWB. The main mass is held by Mr. J. Phillips.

Writeup from MB 109:
Hart: weathering grade clarification

MetBull 101 contained an error in the table of data. The weathering grade of Hart is actually W2/3.
Data from:
  Table 0
  Line 0:
Date:2010 March
Mass (g):966
Shock stage:S2
Weathering grade:W1/2
Fayalite (mol%):0.9-50.2
Ferrosilite (mol%):0.8-16.2
Wollastonite (mol%):0.8-1.2
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.96
Type spec location:UWB
Main mass:J. Phillips
Comments:Submitted by A. Irving
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
References: Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015
Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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United States
     Recommended::   (34° 22' 38"N, 102° 7' 0"W)

     This is 1 of 313 approved meteorites from Texas, United States (plus 2 unapproved names) (plus 3 impact craters)
     This is 1 of 1893 approved meteorites from United States (plus 890 unapproved names) (plus 28 impact craters)
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