Related by context. Frequent words. (Click for all words.) 65 solar nebula 65 silicates 62 photosphere 62 siliceous 61 lithosphere 61 osmium 61 ejecta 61 clasts 60 basalts 60 olivine 60 lavas 60 protoplanetary disk 60 carbonaceous 59 magmas 59 kaolinite 59 iron oxides 59 exosphere 59 gneisses 59 silicate 58 planetesimals 58 metamorphic rocks 58 spherules 58 outer crust 58 sulphide minerals 58 regolith 58 basaltic 58 Archaean 58 corundum 58 oceanic crust 57 sulfide minerals 57 sulphates 57 isotopic composition 57 igneous rocks 57 hydrothermally altered 57 isotope ratios 57 plutons 57 pyroxenite 56 surficial 56 weakly mineralized 56 biotite 56 heavily cratered 56 ionised 56 manganese oxide 56 lunar soil 56 graphitic 56 marine sediments 56 planetary nebulae 56 sulfides 56 aragonite 56 ionized gas 56 copper oxides 56 gabbro 56 calcite 56 hydrogen helium 56 Valles Marineris 56 planetary nebula 56 interbedded 55 andesitic 55 samarium 55 sedimentary rock 55 igneous rock 55 electrochemically 55 mafic volcanic 55 protostars 55 siltstones 55 hydrothermal breccia 55 nanoclusters 55 stromatolites 55 meteorite impacts 55 monazite 55 quartz crystals 55 Earthlike 54 X ray emission 54 breccia pipes 54 vuggy silica 54 volcanic vents 54 haematite 54 continental crust 54 metallicity 54 radioactive decay 54 calcareous 54 bornite 54 interstellar medium 54 peridotite 54 spinel 54 Kuiper Belt objects 54 supernova explosions 54 naturally occurring mineral 54 silica 54 PGEs 54 chemically inert 54 quartz monzonite 54 polar vortex 54 mafic volcanic rocks 54 meteoroids 54 mudstones 54 noble gases 54 perovskite 54 Anomalous gold 54 pyrite mineralization 54 hematite