Northwest Africa 17750 (NWA 17750) CK4 Carbonaceous chondrite meteorite Found in September 2024 in Mali 2.19 grams. Extremely rare Carbonaceous meteorite. 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 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