Northwest Africa 15581 (NWA 15581) CK5 Carbonaceous chondrite meteorite Found in April 2022 in Mali 44 grams End-Cut Guarantee authenticity, You are buying 100% a guaranteed authentic meteorite combined with a signed certificate of authenticity. Shipping: First class express delivery and tracing will be provided. Free shipping worldwide via express delivery service, tracked and traced. OFFICIAL CLASSIFICATION DATA SOURCE: Northwest Africa 15581 Name: Northwest Africa 155817 This is an OFFICIAL meteorite name. Abbreviation: NWA 15581 Observed fall: No Year found: 2022 Country: (Northwest Africa) Mass: 1577 g Classification Recommended: CK5 Comments: Approved 11 Apr 2024 Writeup Writeup from MB 113: Northwest Africa 15581 (NWA 15581) Classification: Carbonaceous chondrite (CK5) Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Sparse well-defined, mostly porphyritic chondrules containing Cr-magnetite stained by Fe terrestrial hydroxides are set in a fine grained matrix containing stained Cr-magnetite, subcalcic augite, intermediate plagioclase and composite grains of ilmenite+Cr spinel. Minor secondary calcite, barite and Fe oxide are present. Geochemistry: Olivine (Fa30.5±0.3, range Fa30.0-30.8, N = 5), low-Ca pyroxene (Fs27.6±1.3Wo0.9±0.4, range Fs26.6-29.2Wo0.4-1.3, Al2O3 3.1-5.3 wt.%, N = 4), pigeonite (Fs23.8Wo9.6, Al2O3 3.0 wt.%), subcalcic augite (Fs14.7Wo30.9, Al2O3 2.2 wt.%), plagioclase (An30.3Or2.5; An50.2Or1.0; N = 2), magnetite (Cr2O3 3.7-3.9 wt.%, N = 3). Classification: Carbonaceous chondrite (CK5). Data from: MB113 Table 0 Line 0: Place of purchase: Mali Date: P 2022 Apr Mass (g): 1577 Pieces: 15 Class: CK5 Shock stage: low Weathering grade: low Fayalite (mol%): 30.6±0.3 Ferrosilite (mol%): 27.6±1.3 Wollastonite (mol%): 0.9±0.4 Classifier: A. Irving, UWS, and P. Carpenter, WUSL