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[ You are not allowed to view attachments ] The dark layers in this boulder are mainly composed of magnetite (Fe3O4) while the red layers are chalcedony, a form of silica (SiO2) that is colored red by tiny iron oxide particles.
Very interesting RD, Thanks.. Take a look at what others think on another forum i posted on.....sorry, you cannot view external links. To see them, please
REGISTER or LOGIN, (parallel grooves), on the flat surface.I don't think the wear would look like that if it was an artifact ground-down for pigment.