Spilites are a metasomatic type of this rock that are formed when seawater is involved in this rock's formation.
Spilites are a metasomatic type of this rock that are formed when seawater is involved in this rock's formation. Group one kimberlites were once named for their similarity to this type of rock. Andesite is more felsic than this rock and less than dacite. When this rock is low in calcium and alkaline pyroxenes and high in iron rich augite, pigeonite or hypersthene, it may be called (*) tholeiitic. This rock is high in magnesium and iron and low in silica, like gabbro, but gabbro forms more slowly and lower in the earth's crust. This rock may be formed at rifts in the ocean, where it cools to form mid-ocean ridges, and lunar mare is made of this rock. For 10 points, name this grey-black extrusive volcanic rock that is extremely prevalent in Iceland and Hawai'i and forms when magma or lava rapidly cools.
Spilites are a metasomatic type of this rock that are formed when seawater is involved in this rock's formation.
basalt