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Northwest Africa 16089
Basic information Name: Northwest Africa 16089
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16089
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 182 g
Recommended:  CK5    [explanation]

This is 1 of 209 approved meteorites classified as CK5.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Comments: Approved 3 Sep 2023
Writeup from MB 112:

Northwest Africa 16089 (NWA 16089)

(Northwest Africa)

Purchased: 2021

Classification: Carbonaceous chondrite (CK5)

History: Purchased from Ali Hnini by Matthew Stream in 2021.

Physical characteristics: Single stone with dark brown fusion crust.

Petrography: (D. Sheikh, Cascadia) Sample is a breccia comprised of chondrules (~0.9 mm) and mm-sized rounded clasts/clast fragments set within a dark, recrystallized matrix. Mineral phases identified include Ni-bearing olivine, low-Ca pyroxene, high-Ca pyroxene, Cr-bearing magnetite, secondary recrystallized feldspar (~30 microns), chromite, and pentlandite.

Geochemistry: Olivine (Fa33.8±0.4, range Fa33.4-35.1, NiO wt. % = 0.6±0.1, n=41), Low-Ca Pyroxene (Fs28.2±0.3Wo0.9±0.1, range Fs27.8-28.5Wo0.8-0.9, n=5), High-Ca Pyroxene (Fs10.9±2.3Wo43.0±2.8, range Fs6.4-13.2Wo40.4-47.1, n=7), Plagioclase (An44.9±11.9, range An30.4-71.6, n=9), Magnetite (Cr2O3 wt. % = 4.7±0.3, TiO2 wt. % = 0.2±0.1, NiO wt. % = 0.4±0.1, n=4).

Classification: Carbonaceous Chondrite (CK5). Olivine, low-Ca pyroxene, and magnetite compositions favor designation as CK; secondary recrystallized feldspar grain sizes appear uniform across clast regions and within the host matrix, suggestive of a type 5 designation.

Specimens: 20.06 g at Cascadia, main mass with Matthew Stream.

Data from:
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2021
Mass (g):182
Shock stage:S2
Weathering grade:low
Fayalite (mol%):33.8±0.4
Ferrosilite (mol%):28.2±0.3, 10.9±2.3
Wollastonite (mol%):0.9±0.1, 43.0±2.8
Classifier:D. Sheikh, Cascadia
Type spec mass (g):20.06
Type spec location:Cascadia
Main mass:Matthew Stream
Comments:CML 1576; 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)
Find references in NASA ADS:
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     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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