The most important factor influencing the texture of igneous rocks is the rate of cooling for the magma. The grains can clearly be seen with the un-aided eye. Aphanitic texture occurs from rapid cooling and consists of individual minerals so small that they cannot be identified without a microscope. Glassy texture consists of ions disorganized as in a liquid but frozen in place by an extremely rapid cooling. Pegmatitic textured rocks have exceptionally large granular mass of crystals formed by hydrothermal solutions late in the cooling process.
Sill are concordant tabular plutons.
Dikes are discordant tabular plutons. Laccoliths are massive concordant plutons with domed tops. Material can be deposited when its agent of transportation no longer has sufficient energy to keep it moving. Material can also be precipitated out of a solution. Dissolved material is converted to a solid.