Because they cool slowly the mineral crystals have enough time to grow to a size which can be easily seen with the naked eye. Thus the intrusive igneous rocks usually have a coarse texture.

• 岩石中矿物晶体就有足够的时间结晶生长，这样，岩石中矿物便足够的大，以致于用肉限也可辨认它们。所以侵入岩通常具有粗粒结构。