Here's why:

* Foliation is a characteristic of metamorphic rocks where minerals are aligned in a parallel arrangement due to pressure. This creates a layered or banded appearance.

* Basalt is an igneous rock, formed from the cooling and solidification of magma or lava. It doesn't undergo the pressure and heat needed to form foliation.

Instead, basalt often has a phaneritic texture, meaning it has visible mineral grains, or an aphanitic texture, meaning the grains are too small to see without a microscope.