Manual of the Mineralogy of Great Britain and Ireland
A mineralogical handbook by Robert Philips Greg and William Garrow Lettsom, published in London in 1858 for collectors and field geologists cataloguing British and Irish minerals. The 111 figures are small line diagrams of crystal forms, drawn in outline with lettered faces and numbered captions, useful as geometric motifs, faceted polyhedra, or annotated technical linework.
