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Northwest Africa 16261
Basic information Name: Northwest Africa 16261
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16261
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 562 g
Meteoritical Bulletin:  MB 112  (2024)  CO3
Recommended:  CO3    [explanation]

This is 1 of 651 approved meteorites (plus 2 unapproved names) classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 30 Sep 2023
Writeup from MB 112:

Northwest Africa 16261 (NWA 16261)

(Northwest Africa)

Purchased: December 2020

Classification: Carbonaceous chondrite (CO3)

History: Acquired online by Pat Brown from Matthew Stream in December 2020.

Physical characteristics: Three stones with a combined mass of 561.6 g (242.3, 202.2, and 117.1 g). Some surfaces are covered with medium grey to brown colored fusion crust. Other surfaces are desert varnished.

Petrography: (P. Brown, MeteoriticsLab; D. Sheikh, Cascadia) Sample is comprised of small chondrules (Av. ~272±176 μm, n=30, ~51 vol. %), refractory inclusions (~1 vol. %), and isolated mineral fragments set within a fine-grained (partially opaque) matrix (~48 vol. %). Accessory phases identified include troilite, kamacite, and taenite.

Geochemistry: (D. Sheikh, Cascadia) Olivine (Fa31.8±11.1, range Fa0.5-40.0, n=51), Low-Ca Pyroxene (Fs4.7±2.6Wo2.0±1.6, range Fs1.7-10.8Wo0.8-4.7, n=20).

Classification: Carbonaceous chondrite (CO3) based on chondrule sizes, chondrule/matrix/refractory inclusion modal abundances, mineral chemistry, and magnetic susceptibility (which falls in the range for CO finds reported in Macke et al., 2011).

Specimens: 20.9 g at Cascadia, main mass with Pat Brown.

Data from:
  Table 0
  Line 0:
Place of purchase:Online
Date:P December 2020
Mass (g):561.6
Shock stage:low
Weathering grade:low
Fayalite (mol%):23.7±1.0
Ferrosilite (mol%):20.6±0.4
Wollastonite (mol%):1.4±0.3
Magnetic suscept.:3.93
Classifier:D. Sheikh, Cascadia; P. Brown, MeteoriticsLab
Type spec mass (g):20.9
Type spec location:Cascadia
Main mass:Pat Brown
Comments:CML 1557; submitted by Daniel Sheikh
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Cartier C., Consolmagno G., Goodrich C., Greshake A., Gross J., Joy K. H., Miao B. and Zhang B. (2024) The Meteoritical Bulletin, no. 112. Meteoritics & Planetary Science 59, 1820–1823. ?
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     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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