An Introduction to the study of Petrology: the Igneous Rocks ... With ... illustrations
Frederick Henry Hatch's 1891 textbook on igneous rocks, published in London by Sonnenschein & Co. for geology students. The 34 figures are circular microscope fields drawn in fine outline: quartz crystals with liquid inclusions, hexagonal sections, and obsidian threaded with microlites and trichites, usable as roundel motifs, scattered-shape patterns, and hairline textures.
