An introduction to the general problems and procedures of the paper is given, and the background and approach are indicated. Zoned granitic pegmatites are divided into four groups with respect to major constituents. Simple pegmatites, composed mainly of biotite, plagioclase, microcline, and quartz, are distinguished from more complex ones with muscovite, late albite, and lithium minerals respectively. Two types of internal zoning are recognized. They differ in the nature of outer zones, which are made up of granite and graphic granite in one pattern, and of quartz and quartz-muscovite assemblages in the other. The first type is preferentially developed in simple pegmatites, and the other one in more complex deposits. Outer zones of the second type pattern mineralogically resemble inner zones, especially the quartz core and its margin, and therefore this pattern is considered to be reversed, and the pattern of simple pegmatites is chosen as a basis for the later discussion. It is shown that pegmatites crystallized from the walls inward and that internal zoning developed rapidly, and not in response to secular changes in geologic conditions. Internal spatial zones are not accepted as strictly synchronous or paragenetic formations. The following main paragenetical groups are recognized instead: the granitoid, the graphic granite, and the pegmatoid zones, the core margin, alkali replacement, and core margin mica groups, and the quartz core and late alterations. A schematic two-dimensional synopsis of mineralization in pegmatites is given, showing the correlation of minerals with development of pegmatites and paragenetical groups within these. Some features of wall rock alteration and of primary pegmatitic cavities are presented.