11.03g Martian Evolved Basaltic Shergottite Meteorite I NWA 17754

On Offer: 11.03 gram exceptional fusion crusted specimen of the evolved basaltic Martian shergottite meteorite NWA 17754. Official Name: Northwest Africa 17754 Abbreviation: NWA 17754 Class: Martian (shergottite) Shock stage: high Weathering grade: low Year found: 2025 Description: A distinctive 11.03 gram NWA 17754 evolved basaltic Martian Shergottite meteorite specimen. This stunning Martian meteorite specimen beautifully displays the interior mineral and glass structure, as well as the exterior fusion crust. The two major phases in this Martian meteorite are pigeonite (~ 60 vol%) with the remaining ~30 vol% composed of maskelynite. Technically not a mineral, maskelynite is a diapplectic impact "glass" created when plagioclase is subjected to intense shock. Glass is typically created when a silicate liquid is cooled (quenched) so fast it does not have time to form a crystal mineral, locking the internal atomic structure into a disorganized "amorphous" configuration commonly referred to as glass. This is not the case with maskelynite. With maskelynite, plagioclase with a perfectly normal well formed crystal structure is shocked into a disorganized state and made into the amorphous "diapplectic" glass maskelynite without ever melting it. So, when this specimen was still attached to the Martian surface it was ~60 vol% pigeonite (pyroxene) and ~30 vol% plagioclase (labradorite), with the plagioclase being converted to the diapplectic glass maskelynite during the impact event that ejected it from the surface of Mars. Other ubiquitous minor phases (~10 vol%) in this Martian meteorite are titanomagnetite, ilmenite, and troilite. This martian meteorite specimen was ejected by an intense impact on the surface of Mars with sufficient force to send it hurtling out of Mars' gravity well, and by some miracle of orbital dynamics and gravitational perturbations ultimately to collide with Earth. The data from the stable oxygen isotope analysis for this Martian meteorite plot starts nicely on the Martian fractionation line (MFL) with other established Martian shergottites and nakhlites and then starts to trend slightly down and to the right of the MFL. See orange X's in the oxygen isotope plot from the Meteoritical Bulletin below. What you get: 11.03 gram NWA 17754 Martian meteorite specimen as shown, membrane display/storage box, and signed Certificate of Authenticity. We offer a 100% no questions asked 30 day return policy. SEE EXCERPTS FROM OFFICIAL METEORITICAL SOCIETY ENTRY BELOW Northwest Africa 17754 Status: Official Basic information Name: Northwest Africa 17754 This is an OFFICIAL meteorite name. Abbreviation: NWA 17754 Observed fall: No Year found: 2025 Country: Algeria Mass: 2.51 kg Classification history: Meteoritical Bulletin, MB 114 (2026): Martian (shergottite) Recommended: Martian (shergottite) This is 1 of 372 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite). Comments: Approved 5 Dec 2025 Writeup Writeup from MB 114: Northwest Africa 17754 (NWA 17754) Algeria Purchased: 2025 Classification: Martian meteorite (Shergottite) History: Purchased by Ali Fettouh from a meteorite dealer in Ouargla, Algeria, May 4, 2025. Physical characteristics: Four pieces, 1038, 926, 207, and 132 g, and many small fragments. Fusion crusted, freshly broken surface reveals gray-green pyroxene crystals and spectacularly shiny maskelynite. Friable. Petrography: (C. Agee, UNM) Electron microprobe analysis and reflected light microscopy of a polished mount show this meteorite to be a basaltic shergottite. The two major phases in this meteorite are clinopyroxene and maskelynite. Ubiquitous minor phases are titanomagnetite, ilmenite, and troilite. The clinopyroxene has a modal abundance of approximately 60%, with significant core to rim zoning indicating an igneous crystallization trend with Mg-rich pigeonite cores, mantled by augite, and rimmed with ferropigeonite. Clinopyroxene average grain sizes are approximately 300-500 μm. Maskelynite has modal abundances of approximately 30%, and most grains are irregular shaped to equant and 100-300 μm in size. Geochemistry: (M. Spilde, UNM) Clinopyroxene Fs39.8±12.3Wo18.9±9.6, Fe/Mn=32±4, n=7; plagioclase An51.0±3.4Ab47.5±3.7, n=5. Oxygen isotopes (K. Ziegler, UNM): 7 acid-washed fragments analyzed by laser fluorination gave δ18O=5.586, 5.044, 5.254, 5.104, 5.670, 5.867, 5.251; δ17O= 3.161, 2.913, 3.029, 2.956, 3.212, 3.301, 3.008; Δ17O= 0.211, 0.249, 0.255, 0.261, 0.218, 0.203, 0.236 (linearized, all per mil, TFL slope=0.528). Classification: Evolved basaltic shergottite. The oxygen isotopic composition has a trend slightly off the Martian fractionation line. Specimens: 20 g plus a probe mount on deposit at UNM, Ali Fettouh holds the main mass. Data from: MB114 Table 0 Line 0: Place of purchase: Ouargla, Algeria Date: P 2025 Mass (g): 2510 Pieces: 4 Class: Martian (shergottite) Shock stage: high Weathering grade: low Ferrosilite (mol%): 39.8±12.3 Wollastonite (mol%): 18.9±9.6 Classifier: C. Agee, UNM Type spec mass (g): 21 Type spec location: UNM Main mass: Ali Fettouh Comments: Fieldname ZF-3000; submitted by C. Agee