The cover shows a new mineral, xieite, recently approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association. This new mineral occurs in the shock vein of the Suizhou L6 chondritic meteorite, which had underwent strong collision and was severely shock-metamorphosed in space. Xieite is a dense mineral with a chemical formula of FeCr₂O₄, and it is a high-pressure polymorph of chromite and formed by solid-state transformation of chromite under shock-induced high pressure and temperature, in association with other high-pressure minerals including ringwoodite, majorite, lingunite and tuite. Xieite has an orthorhombic structure containing edge- and corner-sharing octahedral and dodecahedral sites, where cations of Cr³⁺ and Al³⁺ occupy octahedral sites, whereas Mg²⁺ and Fe²⁺ occupy dodecahedral sites. Xieite could be another potential pressure gauge not only for shock-metamorphosed meteorites, but also for the rocks exhumed from the deep Earth (see the article by CHEN Ming et al. on page 3341).