In Seres pyroxenes in SRCs have Fs18 and olivines Fa18-19; all other elements are below 1 wt.%. One SRC contains Cr-rich spinel. Rare earth elements were only measured in pyroxenes. Olivines and spinels are too small and SiO2 usually does not contain these elements in detectable amounts. The concentrations are again between 0.1-1 times CI-chondritic and REE patterns are flat. Read more (PDF)