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Coolidge
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
Classification
  history:
NHM Catalogue:  5th Edition  (2000)  C3.8-ung
MetBase:  v. 7.1  (2006)  C4-ung
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
Writeuphelp
Writeup from MB 110:

Coolidge

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).

Bibliography:
  • 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)
Catalogs:
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Search for this meteorite in the Natural History Museum collection (U.K.):   
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References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Don Edwards   
Mark Bostick      
Matteo Chinellato   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
METEORITES AUSTRALIA   
Woreczko Jan & Wadi   
Geography:

United States
Coordinates:
     Catalogue of Meteorites:   (38° 2'N, 101° 59'W)
     Recommended::   (38° 2'N, 101° 59'W)

Statistics:
     This is 1 of 147 approved meteorites from Kansas, United States (plus 1 unapproved name) (plus 1 impact crater)
     This is 1 of 1881 approved meteorites from United States (plus 890 unapproved names) (plus 28 impact craters)
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