Granite—a granular crystalline aggregate of quartz, feldspar, and mica; the feldspar typically orthoclase; popularly and properly used for any distinctly granular crystalline rock.
Granitell—a name used to designate a quartz-feldspar rock.
Granitite—a biotite granite with quartz.
Granulite—a fine-grained granite with little or no mica.
Greensand—a sand or sandstone containing a notable percentage of grains of glauconite.
Greenstone—a comprehensive term used to designate igneous and metamorphic crystalline rocks of greenish hue and of intricate and often minute crystallization; they are mostly dolerites, diabases, and diorites; a convenient term for field use where the constituents cannot be determined, and for general use when the variety is unimportant.
Greisen—an aggregate of quartz and mica, i.e., a granite without feldspar.
Greywacke—a sand rock in which the grains are basic silicates instead of quartz.
Hälleflinta—a compact flint-like felsitic rock.
Hornblendite—a rock essentially composed of hornblende.