Robuta

https://cir.nii.ac.jp/crid/1050864181183426944?lang=en Nonmagnetic framboid and associated iron nanoparticles with a space-weathered feature from asteroid... Extraterrestrial minerals on the surface of airless Solar System bodies undergo gradual alteration processes known as space weathering over long periods of... https://bibliographie.uni-tuebingen.de/xmlui/handle/10900/169445 Hydrothermal sulfidation of biogenic magnetite produces framboid-like pyrite hydrothermalmagnetiteproduceslikepyrite