Four types of textures: Phaneritic, Porphyritic, Apanitic (microcrystalline), and Aphanitic (glassy). Samples include: biotite granite, granite, syenite, diorite, gabbro, anorthosite, horneblende basalt porphyry, trachyte porphyry, felsite, andesite, basalt, obsidian, pitchstone, pumice, and scoria