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Basic information Name: Coolidge
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 1937
Country: United States
Mass:help 4.5 kg
NHM Catalogue:  5th Edition  (2000)  C3.8-ung
MetBase:  v. 7.1  (2006)  C4-ung
Meteoritical Bulletin:  MB 110  (2022)  CL4
Recommended:  CL4    [explanation]

This is 1 of 3 approved meteorites classified as CL4.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CL chondrites, and CL chondrites (equilibrated)
Comments: Revised 29 Aug 2021: Reclassification
Writeup from MB 110:


Kansas, United States

Find: 1937

Classification: CL4

Revised classification and description.

Petrography: Carbonaceous chondrite with high chondrule abundance (79 vol%) and low amount of fine-grained matrix (18 vol%). Composed of irregularly formed Type-I chondrules, few Type-II chondrules, refractory inclusions (CAIs, AOAs), inter-chondrule metal and sulfide grains and matrix. Contains high amounts of (partly terrestrially oxidized) metal (magnetic susceptibility log χ (× 10-9 m3/kg) = 4.94). The mean chondrule size is: 404±405 µm (55-2790 μm; n=145). Fragments of chondrules and refractory inclusions occur, but macroscopically this sample is unbrecciated. It is of shock stage C-S2 and has a weathering grade of W2.

Geochemistry: Olivine is equilibrated with a mean value of Fa14.5±0.4. The mean composition of low-Ca pyroxene is Fs9.4±3.9Wo0.9±0.1. Bulk oxygen isotopic composition: δ17O = -6.835±0.216; δ18O = -3.336±0.169; Δ17O = -5.101±0.128 per mil. Bulk Ti and Cr isotopic compositions: ε50Ti ± 2σ = 2.63±0.10; ε54Cr ± 2σ = 0.81±0.10.

Classification: Due to its characteristically low amount of matrix, highly depleted concentrations of volatile elements, high magnetic susceptibility, low Fa values of equilibrated olivine, and unique position in the ε50Ti-ε54Cr diagram, this sample was reclassified as a CL4 chondrite by Metzler et al. (2021).

  • Metzler K., Hezel D.C., Barosch J., Wölfer E., Schneider J.M., Hellmann J.L., Berndt J., Stracke A., Gattacceca J., Greenwood R.C., Franchi I.A., Burkhardt C., and Kleine T. (2021) The Loongana (CL) group of carbonaceous chondrites. Geochim. Cosmochim. Acta 304, 1–31. (link)
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References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Mark Bostick      
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United States
     Catalogue of Meteorites:   (38° 2'N, 101° 59'W)
     Recommended::   (38° 2'N, 101° 59'W)

     This is 1 of 147 approved meteorites from Kansas, United States (plus 1 unapproved name) (plus 1 impact crater)
     This is 1 of 1924 approved meteorites from United States (plus 867 unapproved names) (plus 28 impact craters)
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