I have plant fossils that I want to prepare. The plant remains occur in a thin ferruginous fine-grained ferro-alumosilicate layer. The fossils are covered with calcium sulfate crystals. Those obscure the fossil. It would be a great help if someone could explain how to remove them! I could not find a way to dissolve them, so painstaking manual removal with a pin is the only option i found...
In the picture you can see the row of leaves (bennetittales) with the white crystals on top.