Fig. 1: Hand sample and oxygen isotopic data.
From: Olivine-rich achondrites from Vesta and the missing mantle problem
a Northwest Africa 12217 showing large olivine clasts. The light to dark brown material is terrestrial weathering, typically from oxidation of metal grains and sulfides. Remnant fusion crust is visible in the top right corner of the meteorite. Interstitial areas between grains have been darkened by shock, and they reflect the primary lithology of the meteorites. b Δ17O diagram showing NWA 12217, 12319, and 12562 in relation to other achondrite groups39,62,63,64. The TFL is the mass-dependent terrestrial fractionation line. Errors are smaller than symbols.
