"NWA 4925 exhibits a pronounced light colored weathering rind, typical for desert finds with long terrestrial residence ages. Olivine phenocrysts near to or within the weathering rind do often show a bright red appearance, a sign that most of the iron within these olivines has been oxidized in the terrestrial environment. Overall, the matrix color within or near to the rind is more reddish - reminding us of the same process that gives Mars its red appearance although most of the Martian rocks are originally of grey, or grey to green color. The interior of NWA 4925 is actually dark green, with shock altered dark-brown olivine phenocrysts set in a matrix of more fine grained greenish pyroxenes and dark maskelynite, both bearing witness for the fact that the interior of the rock is more or less pristine and fresh, just as if it left Mars only yesterday. It's that interesting contrast of the more light-colored weathering rind with its neat reddish olivines, and the dark-green, very fresh interior that makes NWA 4925 visually most attractive, and scientifically interesting because it models the surface weathering on the Red Planet. From the samples of NWA 4925 that I could study I would further suspect that the olivine and orthopyroxene phenocrysts show a preferred orientation like in NWA 1195, and other ol-opx-phyric shergottites, something which is indicative of magmatic flow prior to the cooling and solidification of the sample. Other most interesting features are melt inclusions, and small chromites that are enclosed into the large olivine phenocrysts."