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O'Donnell (b)
Basic information Name: O'Donnell (b)
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2018
Country: United States
Mass:help 8 kg
Meteoritical Bulletin:  MB 108  (2020)  H5
Recommended:  H5    [explanation]

This is 1 of 11801 approved meteorites (plus 23 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 21 Nov 2019
Writeup from MB 108:

O’Donnell (b)        32°57.733’N, 101°50.300’W

Texas, United States

Find: 2018

Classification: Ordinary chondrite (H5)

History: ~8 kg found by Michelle Rios working in her garden in O’Donnell, Texas, in March 2018. Sample was initially screened and passed on for classification by New England Meteoritical Services (NEMS).

Physical characteristics: Physical Characteristics: Single stone, iron oxide stained black and dark brown exterior with occasional patches of weathered fusion crust. Saw cut reveals dark interior with a few scattered chondrules, small grains of oxidized metal and bright troilite.

Petrography: (K. Domanik and F. Stephan, UAz) Microprobe examination of a polished mount shows numerous, recognizable, partly re-crystalized chondrules 500-1500 μm in size set in a re-crystalized matrix. Sparse plagioclase grains in matrix mostly 20-50 μm in size. Kamacite and troilite almost completely oxidized. Sample cut by many small iron-oxide weathering veins.

Geochemistry: Mineral compositions and geochemistry: (K. Domanik and F. Stephan, UAz) Olivine Fa19.3±0.3, Fe/Mn=36.5±1.7, n=37; low-Ca pyroxene Fs17.2±0.4Wo1.3±0.2, Fe/Mn=21.8±1.6, n=25.

Classification: Ordinary Chondrite (H5), Weathering grade W3. Found 9.25 km NE of O’Donnell and maybe potentially paired with it given the proximity. However olivine Fa differs slightly from that recorded for O'Donnell (Fa18.6).

Specimens: 20 g and a thin section on deposit at UAz. Michelle Rios holds the main mass.

Data from:
  Table 0
  Line 0:
Mass (g):8000
Shock stage:S4
Weathering grade:W3
Fayalite (mol%):19.3±0.3
Ferrosilite (mol%):17.2±0.4
Wollastonite (mol%):1.3±0.2
Classifier:F. Stephan and K. Domanik, UAz
Type spec mass (g):20
Type spec location:UAz
Main mass:Held by Michelle Rios
Finder:Michelle Rios
Comments:Finder contact information: New England Meteoritical Services, P.O. Box 440, Mendon, MA 01756.; submitted by K. Domanik
   and collections
UAz: Lunar and Planetary Laboratory, University of Arizona, 1629 E. University Blvd., Tucson, AZ 85721, United States (institutional address; updated 14 Jan 2012)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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United States
     Recommended::   (32° 57' 44"N, 101° 50' 18"W)

     This is 1 of 317 approved meteorites from Texas, United States (plus 2 unapproved names) (plus 3 impact craters)
     This is 1 of 1930 approved meteorites from United States (plus 866 unapproved names) (plus 28 impact craters)
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