Plate 11
Cuprite, the red crystals showing characteristic color, other showing the green tarnish of malachite
Malachite (green) and azurite (blue), the two minerals shown together as they very commonly occur
Plate 12
Limonite
The crystal form in which goethite is found, p is the prism faces, b and c are faces formed by beveling the edges of the prism, o is the pyramidal face characteristic of the ends