KUL BHATIA / SCIENCE PHOTO LIBRARY KUL BHATIA / SCIENCE PHOTO LIBRARY
Iron sulphides (the minerals marcasite and pyrite) precipitated from hydrothermal fluids in rocks of the Haughton impact structure on Devon Island, Canada. The white, fluffy material is a mixture of sulphate minerals, including gypsum. The whole assemblage reflects both high-temperature fluid activity (the sulphides) and lower-T weathering and hydrolysis.
Model release not required. Property release not required.