Eric Walker added Hematite - Wikipedia to Hematite

Eric Walker added Collections: Iron, How Did They Make It? Part I, Mining – A Collection of Unmitigated Pedantry to a number of topics

Eric Walker added Collections: Iron, How Did They Make It? Part I, Mining – A Collection of Unmitigated Pedantry and Hematite - Wikipedia to Hematite, and added Hematite to Iron oxides

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