"Metallic iron" refers to the pure form of iron, which is a strong and durable metal that can conduct electricity and has a shiny appearance. Full definition
The key lies in particles of glass and metallic iron in the lunar soil. (discovermagazine.com)
Many meteorites contain high levels of metallic iron, so if one falls in a humid jungle climate, the combination of moisture and oxygen will corrode it. (discovermagazine.com)
By refining and processing the wheat to make foods like breads and crackers, food manufacturers are taking out all the nutrients early in the process, then adding some synthetic versions of nutrients back in that your body struggles to recognize, like metallic iron. (greensmoothiegirl.com)