What term describes an igneous rock that contains crystals measuring approximately 1 cm in size?

Explanation

The correct term is 'Pegmatitic,' which refers to igneous rocks characterized by exceptionally large crystals, typically around 1 cm or larger. 'Intrusive' relates to the rock's formation environment, 'Silicic' and 'Basaltic' describe chemical compositions, so they do not specifically indicate crystal size.