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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
Recommended:  CO3    [explanation]

This is 1 of 642 approved meteorites (plus 1 unapproved name) 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 Meteoritical Bulletin, no. 112, in preparation (2023)
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     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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