Eric Walker added a number of topics to Iron oxides, and added Iron oxides to Oxidation and oxides, Minerals and gems and Iron

Eric Walker added Dunite and Chromite - Wikipedia to Chromite, and added Chromite to Iron chromium oxides

Eric Walker added Iron chromium oxides and Hexavalent chromium to Chromium, and added Chromium to Metals and Chemical elements

Eric Walker added Chromite to Iron chromium oxides, and added Iron chromium oxides to Iron oxides, Minerals and gems and Chromium

Eric Walker added a number of topics and a number of links to Minerals and gems, and added Minerals and gems to Geology, Natural resources and Atoms, molecules, chemicals, minerals, materials and compounds