Green Rust (IMAGE) Weizmann Institute of Science Caption In Lake Matano, Indonesia, (l) low oxygen and high iron concentrations enable the formation of green rust; this may have been the original source of the banded iron formations (r) that are a major source of iron ore today Credit Weizmann Institute of Science Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.