Iddingsite in Martian nakhlites contains various secondary minerals that reflect water–rock interaction on Mars. However, the formation processes of Fe iddingsite are unclear because they include carbonates precipitated under reductive and alkaline conditions sulfates generally oxidative acidic conditions. Mineral types cannot coexist equilibrium. Herein, we characterize carbonate phase meteori...

Northwest Africa (NWA) 5790 is the most recently discovered member of the nakhlite group. Its mineralogy differs from the other nakhlites with a high abundance mesostasis (38.1 3.6 vol%) and scarcity of olivine (4.0 2.2 vol%). Furthermore, zoning of augite phenocrysts, and other petrographic and chemical characteristics suggest that NWA 5790 samples the chilled margin of its parent lava flow/si...

Introduction: Mineralogical studies have demonstrated that the nakhlite SNC meteorites have preserved the effects of water-rock interaction between a hydrothermal brine and the nakhlite parent rocks on Mars. Brittle fracturing and corrosion of olivine grains and mesostasis associated with the hydrothermal event have left veins of zoned Fe-carbonate, Fe-smectite (with minor serpentine), and an a...

Copyright and Moral Rights for the articles on this site are retained by the individual authors and/or other copyright owners. For more information on Open Research Online's data policy on reuse of materials please consult the policies page. Introduction: Northwest Africa (NWA) 5790 is the eighth nakhlite, found in the Sahara (Mauritania?) by nomads and purchased in Erfoud (Morocco). As will be...

Introduction: Only 5 meteorites were classified into unbrecciated lunar mare basalt so far, although there are about 40 lunar meteorites known to date. NWA 032 and its paired meteorite NWA 479 (NWA) are such crystalline mare basalts, and show a porphy-ritic texture composed of euhedral olivine and pyrox-ene grains with dendritic mesostasis of pyroxene, pla-gioclase and accessory minerals (ilmen...

Introduction: Martian meteorite MIL03346 is described as an augite-rich cumulate rock with ~80%, ~3%, and ~21% modal phase proportions of augite (CPX), olivine and glassy mesostasis, respectively, and is classified as a nakhlite [1]. The Mossbauer spectrum for whole rock (WR) MIL 03346 is unusual for Martian meteorites in that it has a distinct magnetite subspectrum (~7% subspectral area) [2]. ...

The material strength of meteorites provides useful information on the make-up and history asteroids. However, unique determination a meteorite is difficult because wide range strengths many exhibit. Even within single sample, complicated textures mineral granular compositions make measurements difficult. Michikami et al. (2019) investigated impact-induced crack growth in ordinary (L5) chondrit...

Chondrules in undifferentiated meteorites are former silicate melt droplets of variable texture and composition. Although widely studied, the chondrule formation mechanisms conditions that explain all properties chondrules yet to be identified. To further constrain processes affected solar nebula on meteorite parent body, we determined situ Si isotope ratios major trace element compositions min...

Introduction: Chondrules are sub-mm to mm-sized igneous inclusions that can comprise up to ~80% of the primitive meteorites called chondrites, and provide us with snapshots of the solar nebula. They are the key to understanding the early history of the Solar System and the formation of terrestrial planets. Chondrules formed in the first few million years (Myr) of the Solar System’s history [e.g...