Basalt
Basalt is the most common Igneous Rock.
It is dark brown or black, and directly results from cooled flowing magma.
One variety of Basalt is Scoria, which has bubble-like cavities where minerals develop.
Some Minerals that are associated with Basalt are Feldspars and Olivine.
Large masses of Basalt occur in India and Brazil.
Basalt is used as a material for roads and buildings.
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