SINCLAIR STAMMERS / Fossils of Goniatites (extinct shelled cephalopods) These specimens are Devonian and preserved in haematite, they were found weathered out on desert surface in southern Morocco.

John Cancalosi / Calcite (Calcium carbonate, CaCO3) with haematite inclusions causing red colour. One of the most common and variable minerals on earth, used in building, metallugy, fertilisers and the chemical indust...