NWA 17750 CK4 Carbonaceous chondrite meteorite - 12 g - (2)

Northwest Africa 17750
(NWA 17750)
CK4 Carbonaceous chondrite meteorite
Found in September 2024 in Mali
Tow meteorites weighing 12 grams End-Cut

Extremely rare Carbonaceous meteorite.

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OFFICIAL CLASSIFICATION DATA SOURCE:

Northwest Africa 17750 (NWA 17750)
Classification: Carbonaceous chondrite (CK4)

Petrography: (A. Irving, UWS, and P. Carpenter, WUSL) Separated well-defined, equilibrated chondrules containing Cr-magnetite are set in a fine-grained matrix containing Cr-magnetite (stained orange in thin section by secondary Fe oxides) with inclusions of pentlandite, chlorapatite, merrillite and ferrihydrite.

Geochemistry: Olivine (Fa32.1±0.3, range Fa31.8-32.4, N = 4), low-Ca pyroxene (Fs26.2±0.9Wo1.2±1.0, range Fs25.4-27.5Wo0.6-2.7, N = 4), high-Ca pyroxene (Fs9.0Wo47.8), plagioclase (An55.3-90.8Or1.5-0.1, N = 3), magnetite (Cr2O3 4.3-4.7 wt.%, N = 4).

Classification: Carbonaceous chondrite (CK4). These specimens differ from texturally similar specimen Northwest Africa 17746 purchased from a different Malian dealer in having distinct compositions of constituent mafic silicates and magnetite.

Specimens: 42.1 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
MB114
Table 0
Line 0:
Place of purchase: Mali
Date: P 2024 Sep
Mass (g): 695
Pieces: many
Class: CK4
Shock stage: low
Weathering grade: low
Fayalite (mol%): 32.1±0.3
Ferrosilite (mol%): 26.2±0.9
Wollastonite (mol%): 1.2±1.0
Classifier: A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g): 21.0
Type spec location: UWB