The main type of igneous rock is porphyritic diorite. A granitic rock with a porphyritic texture is known as a granite porphyry. They range from porphyritic alkaline rhyolite to alkaline aplite to porphyritic alkaline granite. Trachyte is an igneous volcanic rock with an aphanitic to porphyritic texture. Most types of igneous rocks display some degree of porphyritic texture. Crystalline textures include phaneritic, foliated, and porphyritic. It is typically a light colored phaneritic (coarse-grained) to porphyritic granitic rock. Most types of igneous rocks may display some degree of porphyritic texture. Most of the intrusion is a tourmaline muscovite granite which is variably porphyritic. They are very commonly porphyritic, vitreous, and sometimes even vesicular. There are six main types of textures; phaneritic, aphanitic, porphyritic, glassy, pyroclastic and pegmatitic. The rock is porphyritic granite, a very strong form of granite. It may have any texture from glassy to aphanitic to porphyritic. The surface texture of the rocks is trachytic to porphyritic.