Hematite Inside (image) Penn State Caption Pictured is a micrograph of siderite crystals with the red showing hematite inside. The dark blue is magnatite and pyrite. Credit Hiroshi Ohmoto/Yumiko Watanabe Usage Restrictions Non-advertising use only 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.