- is found on the surface - is a dark lava rock - has more aluminum than magnesium - is found as prominent buttes
Basalt is an igneous rock that forms with fast cooling on the surface. Basalt is a dark fine-grained volcanic rock. Aluminum can be up to 17% of the composition of the basalt, while magnesium up to 15%. Basalt is found as buttes where lava flows from the volcanoes were intense.