Simplify the following text for a Grade 13 native English-speaking person.
Original: Hornblende is a common constituent of many igneous and metamorphic rocks such as granite , syenite , diorite , gabbro , basalt , andesite , gneiss , and schist .
Simplified: Hornblende is a common constituent of many igneous and metamorphic rocks such as granite , diorite , gabbro , basalt , andesite , gneiss , and schist .