Johannsen's work on petrography is both a descriptive petrography of the quartz-bearing igneous rocks and an illustration of the author's proposed new method of classification. In it the rocks are ...

the igneous, metamorphic and sedimentary rocks. Figure 1.1: Approximate mineral compositions of the more common types of igneous rocks, e.g. granite approximately 40% orthoclase, 33% quartz, 13% ...

The Atlas of Minerals and Igneous and Metamorphic Rocks in Thin-section provides ... Building on this base, following chapters describe rock textures and types, summarising their petrogenesis within a ...