Andesite rocks can vary greatly in color, but they are generally gray to dark gray in color. However, they can also be:

* Black: Due to the presence of mafic minerals like pyroxene.

* Green: Due to the presence of chlorite minerals.

* Red or brown: Due to the presence of oxidized iron minerals.

* White: Due to the presence of feldspar minerals.

The specific color of an andesite rock is determined by the minerals it contains.