AN UNEQUILIBRATED INCLUSION IN THE ROMERO (H3–4) CHONDRITE

Within the chondritic matrix of Romero (H3–4) is a metal‐poor inclusion consisting largely of olivines showing quench textures, minor low‐Ca pyroxene and rare metal and sulphide. The olivines within this inclusion have the dominant composition Fa8 with a range Fa7, 5–17. The matrix (Romero host) olivines are, in the main, equilibrated with an average composition of Fa18, but are lower in CaO and Cr2O3 than the inclusion olivines. The high chromium content of the inclusion olivines suggests that they formed under conditions different from those represented by the other olivines in Romero.