Mount Boucherie is composed primarily of rhyolite and andesite, which gives the mountain its yellow, tan and pinkish colours on the north and south flanks. The more prominent black and dark gray east and north-east face is dacite. The columns, or pipes, were formed in the later stages of Mount Boucherie's volcanic period, as evidenced by the fact that the dacite columns intersect older rhyolite and andesite volcanic rock. Above the valley floor, the east cliff face is composed of folded volcanic flows of dacite.