Dendrites, copperplate engraving by Pierre Quentin Chedel, from L'histoire naturelle eclaircie dans une de ses parties principales, l'oryctologie,...
Spathose iron ore , Iseve, France; iron pyrites (bisulphide of iron, Elba; arborescent iron pyrites; dendritic oxide of manganese; oxide of...
Coloured engraving from �Marmora et adfines aliquos lapides� by Adam Ludwig Wirsing published in Nuremberg in 1775. Wirsing was an important engraver...
Hand-coloured engraving made c 1775 showing: 1) stone with relief of two insects; 2) black fossil stone; 3) calcareous stone showing crayfish...
Hand-coloured engraving of dendrites , some of which have been enhanced by the artist to make them more remarkable. At the time there was little...式樣
Combined PMC/iron oxide dendrites. Combined PMC/iron oxide dendrites. Light micrograph in bright field/darkground. Magnification x1000.